624335981 has 2 divisors, whose sum is σ = 624335982. Its totient is φ = 624335980.

The previous prime is 624335951. The next prime is 624336017. The reversal of 624335981 is 189533426.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 424566025 + 199769956 = 20605^2 + 14134^2 .

It is a cyclic number.

It is not a de Polignac number, because 624335981 - 2⁶ = 624335917 is a prime.

It is a super-2 number, since 2×624335981² = 779590834342464722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (624335911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 312167990 + 312167991.

It is an arithmetic number, because the mean of its divisors is an integer number (312167991).

Almost surely, 2^624335981 is an apocalyptic number.

It is an amenable number.

624335981 is a deficient number, since it is larger than the sum of its proper divisors (1).

624335981 is an equidigital number, since it uses as much as digits as its factorization.

624335981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 155520, while the sum is 41.

The square root of 624335981 is about 24986.7160907551. The cubic root of 624335981 is about 854.6850776396.

It can be divided in two parts, 6243 and 35981, that added together give a palindrome (42224).

The spelling of 624335981 in words is "six hundred twenty-four million, three hundred thirty-five thousand, nine hundred eighty-one".