625550121 has 45 divisors (see below), whose sum is σ = 1089774279. Its totient is φ = 356556816.

The previous prime is 625550089. The next prime is 625550143. The reversal of 625550121 is 121055526.

The square root of 625550121 is 25011.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 419225625 + 206324496 = 20475^2 + 14364^2 .

It is not a de Polignac number, because 625550121 - 2⁵ = 625550089 is a prime.

It is a super-2 number, since 2×625550121² = 782625907766229282, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (625550171) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 1575495 + ... + 1575891.

Almost surely, 2^625550121 is an apocalyptic number.

625550121 is the 25011-st square number.

625550121 is the 12506-th centered octagonal number.

It is an amenable number.

625550121 is a deficient number, since it is larger than the sum of its proper divisors (464224158).

625550121 is an frugal number, since it uses more digits than its factorization.

625550121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 820 (or 407 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 27.

The cubic root of 625550121 is about 855.2387514224.

The spelling of 625550121 in words is "six hundred twenty-five million, five hundred fifty thousand, one hundred twenty-one".