Search a number
-
+
31398682551 = 367978115971
BaseRepresentation
bin11101001111100000…
…011101111110110111
310000001020011100010120
4131033200131332313
51003301030320201
622231354423023
72161042253355
oct351740357667
9100036140116
1031398682551
1112352812a25
126103431a73
132c650a2002
14173c0d67d5
15c3b80d536
hex74f81dfb7

31398682551 has 16 divisors (see below), whose sum is σ = 42496764288. Its totient is φ = 20616631200.

The previous prime is 31398682543. The next prime is 31398682571. The reversal of 31398682551 is 15528689313.

It is a happy number.

It is not a de Polignac number, because 31398682551 - 23 = 31398682543 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31398682494 and 31398682503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31398682531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1957996 + ... + 1973966.

It is an arithmetic number, because the mean of its divisors is an integer number (2656047768).

Almost surely, 231398682551 is an apocalyptic number.

31398682551 is a deficient number, since it is larger than the sum of its proper divisors (11098081737).

31398682551 is a wasteful number, since it uses less digits than its factorization.

31398682551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25822.

The product of its digits is 1555200, while the sum is 51.

The spelling of 31398682551 in words is "thirty-one billion, three hundred ninety-eight million, six hundred eighty-two thousand, five hundred fifty-one".

Divisors: 1 3 67 201 9781 15971 29343 47913 655327 1070057 1965981 3210171 156212351 468637053 10466227517 31398682551