624139897 has 2 divisors, whose sum is σ = 624139898. Its totient is φ = 624139896.

The previous prime is 624139847. The next prime is 624139961. The reversal of 624139897 is 798931426.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 486687721 + 137452176 = 22061^2 + 11724^2 .

It is a cyclic number.

It is not a de Polignac number, because 624139897 - 2¹⁹ = 623615609 is a prime.

It is a super-2 number, since 2×624139897² = 779101222054341218, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 624139897.

It is not a weakly prime, because it can be changed into another prime (624139847) 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, 312069948 + 312069949.

It is an arithmetic number, because the mean of its divisors is an integer number (312069949).

Almost surely, 2^624139897 is an apocalyptic number.

It is an amenable number.

624139897 is a deficient number, since it is larger than the sum of its proper divisors (1).

624139897 is an equidigital number, since it uses as much as digits as its factorization.

624139897 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 653184, while the sum is 49.

The square root of 624139897 is about 24982.7920177069. The cubic root of 624139897 is about 854.5955918383.

The spelling of 624139897 in words is "six hundred twenty-four million, one hundred thirty-nine thousand, eight hundred ninety-seven".