652781709 has 6 divisors (see below), whose sum is σ = 942906926. Its totient is φ = 435187800.

The previous prime is 652781693. The next prime is 652781711. The reversal of 652781709 is 907187256.

It can be written as a sum of positive squares in only one way, i.e., 634888809 + 17892900 = 25197^2 + 4230^2 .

It is not a de Polignac number, because 652781709 - 2⁴ = 652781693 is a prime.

It is a super-2 number, since 2×652781709² = 852247919209921362, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (652781719) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 36265642 + ... + 36265659.

Almost surely, 2^652781709 is an apocalyptic number.

It is an amenable number.

652781709 is a deficient number, since it is larger than the sum of its proper divisors (290125217).

652781709 is a wasteful number, since it uses less digits than its factorization.

652781709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72531307 (or 72531304 counting only the distinct ones).

The product of its (nonzero) digits is 211680, while the sum is 45.

The square root of 652781709 is about 25549.5931278758. The cubic root of 652781709 is about 867.4730519524.

The spelling of 652781709 in words is "six hundred fifty-two million, seven hundred eighty-one thousand, seven hundred nine".