623991107 has 2 divisors, whose sum is σ = 623991108. Its totient is φ = 623991106.

The previous prime is 623991073. The next prime is 623991163. The reversal of 623991107 is 701199326.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 623991107 - 2¹⁴ = 623974723 is a prime.

It is not a weakly prime, because it can be changed into another prime (623991187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 311995553 + 311995554.

It is an arithmetic number, because the mean of its divisors is an integer number (311995554).

Almost surely, 2^623991107 is an apocalyptic number.

623991107 is a deficient number, since it is larger than the sum of its proper divisors (1).

623991107 is an equidigital number, since it uses as much as digits as its factorization.

623991107 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20412, while the sum is 38.

The square root of 623991107 is about 24979.8139905004. The cubic root of 623991107 is about 854.5276768381.

The spelling of 623991107 in words is "six hundred twenty-three million, nine hundred ninety-one thousand, one hundred seven".