623825021 has 4 divisors (see below), whose sum is σ = 650947872. Its totient is φ = 596702172.

The previous prime is 623825017. The next prime is 623825051. The reversal of 623825021 is 120528326.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 623825021 - 2² = 623825017 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (623825011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13561391 + ... + 13561436.

It is an arithmetic number, because the mean of its divisors is an integer number (162736968).

Almost surely, 2^623825021 is an apocalyptic number.

It is an amenable number.

623825021 is a deficient number, since it is larger than the sum of its proper divisors (27122851).

623825021 is a wasteful number, since it uses less digits than its factorization.

623825021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27122850.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 623825021 is about 24976.4893650008. The cubic root of 623825021 is about 854.4518543485.

The spelling of 623825021 in words is "six hundred twenty-three million, eight hundred twenty-five thousand, twenty-one".