624991231 has 2 divisors, whose sum is σ = 624991232. Its totient is φ = 624991230.

The previous prime is 624991207. The next prime is 624991291. The reversal of 624991231 is 132199426.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 624991231 - 2⁹ = 624990719 is a prime.

It is a super-4 number, since 4×624991231⁴ (a number of 36 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (624991291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 312495615 + 312495616.

It is an arithmetic number, because the mean of its divisors is an integer number (312495616).

Almost surely, 2^624991231 is an apocalyptic number.

624991231 is a deficient number, since it is larger than the sum of its proper divisors (1).

624991231 is an equidigital number, since it uses as much as digits as its factorization.

624991231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23328, while the sum is 37.

The square root of 624991231 is about 24999.8246193848. The cubic root of 624991231 is about 854.9839747119.

The spelling of 624991231 in words is "six hundred twenty-four million, nine hundred ninety-one thousand, two hundred thirty-one".