652161721 has 2 divisors, whose sum is σ = 652161722. Its totient is φ = 652161720.

The previous prime is 652161709. The next prime is 652161739. The reversal of 652161721 is 127161256.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 649485225 + 2676496 = 25485^2 + 1636^2 .

It is a cyclic number.

It is not a de Polignac number, because 652161721 - 2⁵ = 652161689 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (652161761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 326080860 + 326080861.

It is an arithmetic number, because the mean of its divisors is an integer number (326080861).

Almost surely, 2^652161721 is an apocalyptic number.

It is an amenable number.

652161721 is a deficient number, since it is larger than the sum of its proper divisors (1).

652161721 is an equidigital number, since it uses as much as digits as its factorization.

652161721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5040, while the sum is 31.

The square root of 652161721 is about 25537.4572148442. The cubic root of 652161721 is about 867.1983336542.

The spelling of 652161721 in words is "six hundred fifty-two million, one hundred sixty-one thousand, seven hundred twenty-one".