709664921 has 16 divisors (see below), whose sum is σ = 847102080. Its totient is φ = 581800320.

The previous prime is 709664899. The next prime is 709664929. The reversal of 709664921 is 129466907.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-709664921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (709664929) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7940 + ... + 38501.

It is an arithmetic number, because the mean of its divisors is an integer number (52943880).

Almost surely, 2^709664921 is an apocalyptic number.

It is an amenable number.

709664921 is a deficient number, since it is larger than the sum of its proper divisors (137437159).

709664921 is a wasteful number, since it uses less digits than its factorization.

709664921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46544.

The product of its (nonzero) digits is 163296, while the sum is 44.

The square root of 709664921 is about 26639.5368015287. The cubic root of 709664921 is about 891.9717765574.

The spelling of 709664921 in words is "seven hundred nine million, six hundred sixty-four thousand, nine hundred twenty-one".