651139161 has 4 divisors (see below), whose sum is σ = 868185552. Its totient is φ = 434092772.

The previous prime is 651139129. The next prime is 651139169. The reversal of 651139161 is 161931156.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 651139161 - 2⁵ = 651139129 is a prime.

It is not an unprimeable number, because it can be changed into a prime (651139169) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 108523191 + ... + 108523196.

It is an arithmetic number, because the mean of its divisors is an integer number (217046388).

Almost surely, 2^651139161 is an apocalyptic number.

It is an amenable number.

651139161 is a deficient number, since it is larger than the sum of its proper divisors (217046391).

651139161 is a wasteful number, since it uses less digits than its factorization.

651139161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217046390.

The product of its digits is 4860, while the sum is 33.

The square root of 651139161 is about 25517.4285734280. The cubic root of 651139161 is about 866.7448540078.

The spelling of 651139161 in words is "six hundred fifty-one million, one hundred thirty-nine thousand, one hundred sixty-one".