651321172 has 12 divisors (see below), whose sum is σ = 1166319616. Its totient is φ = 318087000.

The previous prime is 651321163. The next prime is 651321173. The reversal of 651321172 is 271123156.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 651321172.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (651321173) 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, 1893204 + ... + 1893547.

Almost surely, 2^651321172 is an apocalyptic number.

It is an amenable number.

651321172 is a deficient number, since it is larger than the sum of its proper divisors (514998444).

651321172 is a wasteful number, since it uses less digits than its factorization.

651321172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3786798 (or 3786796 counting only the distinct ones).

The product of its digits is 2520, while the sum is 28.

The square root of 651321172 is about 25520.9947298298. The cubic root of 651321172 is about 866.8256060243.

The spelling of 651321172 in words is "six hundred fifty-one million, three hundred twenty-one thousand, one hundred seventy-two".