625217621 has 8 divisors (see below), whose sum is σ = 718483584. Its totient is φ = 532938960.

The previous prime is 625217617. The next prime is 625217623. The reversal of 625217621 is 126712526.

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 625217621 - 2² = 625217617 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (625217623) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 245465 + ... + 247998.

It is an arithmetic number, because the mean of its divisors is an integer number (89810448).

Almost surely, 2^625217621 is an apocalyptic number.

It is an amenable number.

625217621 is a deficient number, since it is larger than the sum of its proper divisors (93265963).

625217621 is a wasteful number, since it uses less digits than its factorization.

625217621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 493651.

The product of its digits is 10080, while the sum is 32.

The square root of 625217621 is about 25004.3520411947. The cubic root of 625217621 is about 855.0871956032.

The spelling of 625217621 in words is "six hundred twenty-five million, two hundred seventeen thousand, six hundred twenty-one".