625589521 has 4 divisors (see below), whose sum is σ = 640847844. Its totient is φ = 610331200.

The previous prime is 625589513. The next prime is 625589551. The reversal of 625589521 is 125985526.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 125985526 = 2 ⋅62992763.

It can be written as a sum of positive squares in 2 ways, for example, as 104837121 + 520752400 = 10239^2 + 22820^2 .

It is a cyclic number.

It is not a de Polignac number, because 625589521 - 2³ = 625589513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (625589551) 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, 7629100 + ... + 7629181.

It is an arithmetic number, because the mean of its divisors is an integer number (160211961).

Almost surely, 2^625589521 is an apocalyptic number.

It is an amenable number.

625589521 is a deficient number, since it is larger than the sum of its proper divisors (15258323).

625589521 is a wasteful number, since it uses less digits than its factorization.

625589521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15258322.

The product of its digits is 216000, while the sum is 43.

The square root of 625589521 is about 25011.7876410304. The cubic root of 625589521 is about 855.2567066580.

The spelling of 625589521 in words is "six hundred twenty-five million, five hundred eighty-nine thousand, five hundred twenty-one".