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1286420631 = 31934964667
BaseRepresentation
bin100110010101101…
…0011100010010111
310022122121221100120
41030223103202113
510113310430011
6331352243023
743610252316
oct11453234227
93278557316
101286420631
11600172951
122ba9a0473
13176692152
14c2bc827d
1577e0ba06
hex4cad3897

1286420631 has 16 divisors (see below), whose sum is σ = 1810704000. Its totient is φ = 810135648.

The previous prime is 1286420627. The next prime is 1286420647. The reversal of 1286420631 is 1360246821.

1286420631 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1286420631 - 22 = 1286420627 is a prime.

It is a super-2 number, since 2×12864206312 = 3309756079724876322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1286420592 and 1286420601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1286420621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12441 + ... + 52226.

It is an arithmetic number, because the mean of its divisors is an integer number (113169000).

Almost surely, 21286420631 is an apocalyptic number.

1286420631 is a deficient number, since it is larger than the sum of its proper divisors (524283369).

1286420631 is a wasteful number, since it uses less digits than its factorization.

1286420631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65038.

The product of its (nonzero) digits is 13824, while the sum is 33.

The square root of 1286420631 is about 35866.7064420473. The cubic root of 1286420631 is about 1087.5794647706.

The spelling of 1286420631 in words is "one billion, two hundred eighty-six million, four hundred twenty thousand, six hundred thirty-one".

Divisors: 1 3 19 57 349 1047 6631 19893 64667 194001 1228673 3686019 22568783 67706349 428806877 1286420631