651987925 has 12 divisors (see below), whose sum is σ = 816802756. Its totient is φ = 516211200.

The previous prime is 651987899. The next prime is 651987929. The reversal of 651987925 is 529789156.

It can be written as a sum of positive squares in 6 ways, for example, as 28536964 + 623450961 = 5342^2 + 24969^2 .

It is not a de Polignac number, because 651987925 - 2⁷ = 651987797 is a prime.

It is a hoax number, since the sum of its digits (52) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (651987929) 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 11 ways as a sum of consecutive naturals, for example, 132006 + ... + 136855.

Almost surely, 2^651987925 is an apocalyptic number.

It is an amenable number.

651987925 is a deficient number, since it is larger than the sum of its proper divisors (164814831).

651987925 is a wasteful number, since it uses less digits than its factorization.

651987925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268968 (or 268963 counting only the distinct ones).

The product of its digits is 1360800, while the sum is 52.

The square root of 651987925 is about 25534.0542217643. The cubic root of 651987925 is about 867.1212929515.

The spelling of 651987925 in words is "six hundred fifty-one million, nine hundred eighty-seven thousand, nine hundred twenty-five".