623666031 has 4 divisors (see below), whose sum is σ = 831554712. Its totient is φ = 415777352.

The previous prime is 623666003. The next prime is 623666039. The reversal of 623666031 is 130666326.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 623666031 - 2²⁹ = 86795119 is a prime.

It is a super-2 number, since 2×623666031² = 777918636446585922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 623665983 and 623666001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (623666039) 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, 103944336 + ... + 103944341.

It is an arithmetic number, because the mean of its divisors is an integer number (207888678).

Almost surely, 2^623666031 is an apocalyptic number.

623666031 is a deficient number, since it is larger than the sum of its proper divisors (207888681).

623666031 is a wasteful number, since it uses less digits than its factorization.

623666031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207888680.

The product of its (nonzero) digits is 23328, while the sum is 33.

The square root of 623666031 is about 24973.3063690013. The cubic root of 623666031 is about 854.3792587550.

The spelling of 623666031 in words is "six hundred twenty-three million, six hundred sixty-six thousand, thirty-one".