651461988 has 12 divisors (see below), whose sum is σ = 1520078000. Its totient is φ = 217153992.

The previous prime is 651461977. The next prime is 651461999. The reversal of 651461988 is 889164156.

It is an interprime number because it is at equal distance from previous prime (651461977) and next prime (651461999).

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27144238 + ... + 27144261.

Almost surely, 2^651461988 is an apocalyptic number.

It is an amenable number.

651461988 is an abundant number, since it is smaller than the sum of its proper divisors (868616012).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

651461988 is a wasteful number, since it uses less digits than its factorization.

651461988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54288506 (or 54288504 counting only the distinct ones).

The product of its digits is 414720, while the sum is 48.

The square root of 651461988 is about 25523.7534073655. The cubic root of 651461988 is about 866.8880709157. Note that the first 3 decimals are identical.

The spelling of 651461988 in words is "six hundred fifty-one million, four hundred sixty-one thousand, nine hundred eighty-eight".