641423025 has 36 divisors (see below), whose sum is σ = 1157957632. Its totient is φ = 339383520.

The previous prime is 641423021. The next prime is 641423047. The reversal of 641423025 is 520324146.

It is not a de Polignac number, because 641423025 - 2² = 641423021 is a prime.

It is a super-2 number, since 2×641423025² = 822846994000301250, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 641423025.

It is not an unprimeable number, because it can be changed into a prime (641423021) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 17352 + ... + 39798.

Almost surely, 2^641423025 is an apocalyptic number.

It is an amenable number.

641423025 is a deficient number, since it is larger than the sum of its proper divisors (516534607).

641423025 is a wasteful number, since it uses less digits than its factorization.

641423025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22590 (or 22582 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 641423025 is about 25326.3306659295. The cubic root of 641423025 is about 862.4121145486.

The spelling of 641423025 in words is "six hundred forty-one million, four hundred twenty-three thousand, twenty-five".