625441421 has 4 divisors (see below), whose sum is σ = 682299744. Its totient is φ = 568583100.

The previous prime is 625441417. The next prime is 625441447. The reversal of 625441421 is 124144526.

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 625441421 - 2² = 625441417 is a prime.

It is a super-2 number, since 2×625441421² = 782353942204998482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (625441471) 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, 28429145 + ... + 28429166.

It is an arithmetic number, because the mean of its divisors is an integer number (170574936).

Almost surely, 2^625441421 is an apocalyptic number.

It is an amenable number.

625441421 is a deficient number, since it is larger than the sum of its proper divisors (56858323).

625441421 is a wasteful number, since it uses less digits than its factorization.

625441421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56858322.

The product of its digits is 7680, while the sum is 29.

The square root of 625441421 is about 25008.8268617302. The cubic root of 625441421 is about 855.1892111141.

Adding to 625441421 its reverse (124144526), we get a palindrome (749585947).

The spelling of 625441421 in words is "six hundred twenty-five million, four hundred forty-one thousand, four hundred twenty-one".