651172957 has 4 divisors (see below), whose sum is σ = 657620316. Its totient is φ = 644725600.

The previous prime is 651172943. The next prime is 651172961. The reversal of 651172957 is 759271156.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 606095161 + 45077796 = 24619^2 + 6714^2 .

It is a cyclic number.

It is not a de Polignac number, because 651172957 - 2⁷ = 651172829 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (651172937) 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, 3223528 + ... + 3223729.

It is an arithmetic number, because the mean of its divisors is an integer number (164405079).

Almost surely, 2^651172957 is an apocalyptic number.

It is an amenable number.

651172957 is a deficient number, since it is larger than the sum of its proper divisors (6447359).

651172957 is a wasteful number, since it uses less digits than its factorization.

651172957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6447358.

The product of its digits is 132300, while the sum is 43.

The square root of 651172957 is about 25518.0907788964. The cubic root of 651172957 is about 866.7598492675.

The spelling of 651172957 in words is "six hundred fifty-one million, one hundred seventy-two thousand, nine hundred fifty-seven".