623164981 has 2 divisors, whose sum is σ = 623164982. Its totient is φ = 623164980.

The previous prime is 623164973. The next prime is 623164991. The reversal of 623164981 is 189461326.

623164981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 563350225 + 59814756 = 23735^2 + 7734^2 .

It is a cyclic number.

It is not a de Polignac number, because 623164981 - 2³ = 623164973 is a prime.

It is a super-2 number, since 2×623164981² = 776669187089460722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (623164931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 311582490 + 311582491.

It is an arithmetic number, because the mean of its divisors is an integer number (311582491).

Almost surely, 2^623164981 is an apocalyptic number.

It is an amenable number.

623164981 is a deficient number, since it is larger than the sum of its proper divisors (1).

623164981 is an equidigital number, since it uses as much as digits as its factorization.

623164981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 62208, while the sum is 40.

The square root of 623164981 is about 24963.2726420235. The cubic root of 623164981 is about 854.1503961916.

The spelling of 623164981 in words is "six hundred twenty-three million, one hundred sixty-four thousand, nine hundred eighty-one".