625921 has 8 divisors (see below), whose sum is σ = 658688. Its totient is φ = 594000.

The previous prime is 625913. The next prime is 625927. The reversal of 625921 is 129526.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 625921 - 2³ = 625913 is a prime.

It is not an unprimeable number, because it can be changed into a prime (625927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1726 + ... + 2056.

It is an arithmetic number, because the mean of its divisors is an integer number (82336).

It is a Poulet number, since it divides 2⁶²⁵⁹²⁰-1.

2⁶²⁵⁹²¹ is an apocalyptic number.

625921 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

625921 is a deficient number, since it is larger than the sum of its proper divisors (32767).

625921 is a wasteful number, since it uses less digits than its factorization.

625921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 423.

The product of its digits is 1080, while the sum is 25.

The square root of 625921 is about 791.1516921552. The cubic root of 625921 is about 85.5407737310.

The spelling of 625921 in words is "six hundred twenty-five thousand, nine hundred twenty-one".