652685991 has 16 divisors (see below), whose sum is σ = 876129408. Its totient is φ = 432194400.

The previous prime is 652685951. The next prime is 652685993. The reversal of 652685991 is 199586256.

It is not a de Polignac number, because 652685991 - 2⁹ = 652685479 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (652685993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 303781 + ... + 305921.

It is an arithmetic number, because the mean of its divisors is an integer number (54758088).

Almost surely, 2^652685991 is an apocalyptic number.

652685991 is a deficient number, since it is larger than the sum of its proper divisors (223443417).

652685991 is a wasteful number, since it uses less digits than its factorization.

652685991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2782.

The product of its digits is 1166400, while the sum is 51.

The square root of 652685991 is about 25547.7198786898. The cubic root of 652685991 is about 867.4306504149.

The spelling of 652685991 in words is "six hundred fifty-two million, six hundred eighty-five thousand, nine hundred ninety-one".