623971311 has 4 divisors (see below), whose sum is σ = 831961752. Its totient is φ = 415980872.

The previous prime is 623971303. The next prime is 623971319. The reversal of 623971311 is 113179326.

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

It is an interprime number because it is at equal distance from previous prime (623971303) and next prime (623971319).

It is a cyclic number.

It is not a de Polignac number, because 623971311 - 2³ = 623971303 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (623971319) 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, 103995216 + ... + 103995221.

It is an arithmetic number, because the mean of its divisors is an integer number (207990438).

Almost surely, 2^623971311 is an apocalyptic number.

623971311 is a deficient number, since it is larger than the sum of its proper divisors (207990441).

623971311 is a wasteful number, since it uses less digits than its factorization.

623971311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207990440.

The product of its digits is 6804, while the sum is 33.

The square root of 623971311 is about 24979.4177474176. The cubic root of 623971311 is about 854.5186401661.

The spelling of 623971311 in words is "six hundred twenty-three million, nine hundred seventy-one thousand, three hundred eleven".