623468921 has 2 divisors, whose sum is σ = 623468922. Its totient is φ = 623468920.

The previous prime is 623468917. The next prime is 623468927. The reversal of 623468921 is 129864326.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 378108025 + 245360896 = 19445^2 + 15664^2 .

It is a cyclic number.

It is not a de Polignac number, because 623468921 - 2² = 623468917 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (623468927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 311734460 + 311734461.

It is an arithmetic number, because the mean of its divisors is an integer number (311734461).

Almost surely, 2^623468921 is an apocalyptic number.

It is an amenable number.

623468921 is a deficient number, since it is larger than the sum of its proper divisors (1).

623468921 is an equidigital number, since it uses as much as digits as its factorization.

623468921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 124416, while the sum is 41.

The square root of 623468921 is about 24969.3596433709. The cubic root of 623468921 is about 854.2892402557.

The spelling of 623468921 in words is "six hundred twenty-three million, four hundred sixty-eight thousand, nine hundred twenty-one".