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10202031031 = 12780330953
BaseRepresentation
bin10011000000001011…
…01010001110110111
3222022222220212121011
421200011222032313
5131343204443111
64404200533051
7510546555463
oct114005521667
928288825534
1010202031031
114365864a05
121b88781187
13c6780606a
146cad134a3
153ea9b9021
hex26016a3b7

10202031031 has 4 divisors (see below), whose sum is σ = 10282362112. Its totient is φ = 10121699952.

The previous prime is 10202031029. The next prime is 10202031101. The reversal of 10202031031 is 13013020201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13013020201 = 23565783487.

It is a cyclic number.

It is not a de Polignac number, because 10202031031 - 21 = 10202031029 is a prime.

It is a super-2 number, since 2×102020310312 (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10202031001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40165350 + ... + 40165603.

It is an arithmetic number, because the mean of its divisors is an integer number (2570590528).

Almost surely, 210202031031 is an apocalyptic number.

10202031031 is a deficient number, since it is larger than the sum of its proper divisors (80331081).

10202031031 is an equidigital number, since it uses as much as digits as its factorization.

10202031031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80331080.

The product of its (nonzero) digits is 36, while the sum is 13.

Adding to 10202031031 its reverse (13013020201), we get a palindrome (23215051232).

The spelling of 10202031031 in words is "ten billion, two hundred two million, thirty-one thousand, thirty-one".

Divisors: 1 127 80330953 10202031031