31115520203 has 2 divisors, whose sum is σ = 31115520204. Its totient is φ = 31115520202.

The previous prime is 31115520199. The next prime is 31115520277. The reversal of 31115520203 is 30202551113.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31115520203 - 2² = 31115520199 is a prime.

It is a super-2 number, since 2×31115520203² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31115523203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15557760101 + 15557760102.

It is an arithmetic number, because the mean of its divisors is an integer number (15557760102).

Almost surely, 2^31115520203 is an apocalyptic number.

31115520203 is a deficient number, since it is larger than the sum of its proper divisors (1).

31115520203 is an equidigital number, since it uses as much as digits as its factorization.

31115520203 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 900, while the sum is 23.

The spelling of 31115520203 in words is "thirty-one billion, one hundred fifteen million, five hundred twenty thousand, two hundred three".