625205021 has 16 divisors (see below), whose sum is σ = 765744384. Its totient is φ = 498731904.

The previous prime is 625205017. The next prime is 625205041. The reversal of 625205021 is 120502526.

It is a cyclic number.

It is not a de Polignac number, because 625205021 - 2² = 625205017 is a prime.

It is a super-2 number, since 2×625205021² = 781762636567220882, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (625205041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46520 + ... + 58433.

It is an arithmetic number, because the mean of its divisors is an integer number (47859024).

Almost surely, 2^625205021 is an apocalyptic number.

It is an amenable number.

625205021 is a deficient number, since it is larger than the sum of its proper divisors (140539363).

625205021 is a wasteful number, since it uses less digits than its factorization.

625205021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105020.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 625205021 is about 25004.1000837863. The cubic root of 625205021 is about 855.0814513787.

Adding to 625205021 its reverse (120502526), we get a palindrome (745707547).

The spelling of 625205021 in words is "six hundred twenty-five million, two hundred five thousand, twenty-one".