659712921 has 12 divisors (see below), whose sum is σ = 1023228432. Its totient is φ = 376978728.

The previous prime is 659712883. The next prime is 659712929. The reversal of 659712921 is 129217956.

It is not a de Polignac number, because 659712921 - 2⁹ = 659712409 is a prime.

It is a super-2 number, since 2×659712921² = 870442276268704482, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (659712929) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2243775 + ... + 2244068.

It is an arithmetic number, because the mean of its divisors is an integer number (85269036).

Almost surely, 2^659712921 is an apocalyptic number.

It is an amenable number.

659712921 is a deficient number, since it is larger than the sum of its proper divisors (363515511).

659712921 is a wasteful number, since it uses less digits than its factorization.

659712921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4487860 (or 4487853 counting only the distinct ones).

The product of its digits is 68040, while the sum is 42.

The square root of 659712921 is about 25684.8772821674. The cubic root of 659712921 is about 870.5325145228.

The spelling of 659712921 in words is "six hundred fifty-nine million, seven hundred twelve thousand, nine hundred twenty-one".