623535990931 has 4 divisors (see below), whose sum is σ = 712612561072. Its totient is φ = 534459420792.

The previous prime is 623535990919. The next prime is 623535991009. The reversal of 623535990931 is 139099535326.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-623535990931 is a prime.

It is a super-2 number, since 2×623535990931² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (623535990031) 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, 44538285060 + ... + 44538285073.

It is an arithmetic number, because the mean of its divisors is an integer number (178153140268).

Almost surely, 2^623535990931 is an apocalyptic number.

623535990931 is a deficient number, since it is larger than the sum of its proper divisors (89076570141).

623535990931 is an equidigital number, since it uses as much as digits as its factorization.

623535990931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89076570140.

The product of its (nonzero) digits is 5904900, while the sum is 55.

The spelling of 623535990931 in words is "six hundred twenty-three billion, five hundred thirty-five million, nine hundred ninety thousand, nine hundred thirty-one".