651442561 has 16 divisors (see below), whose sum is σ = 831080448. Its totient is φ = 495810000.

The previous prime is 651442553. The next prime is 651442577. The reversal of 651442561 is 165244156.

It is not a de Polignac number, because 651442561 - 2³ = 651442553 is a prime.

It is a pancake number, because a pancake can be divided into 651442561 parts by 36095 straight cuts.

It is not an unprimeable number, because it can be changed into a prime (651442661) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 95065 + ... + 101686.

It is an arithmetic number, because the mean of its divisors is an integer number (51942528).

Almost surely, 2^651442561 is an apocalyptic number.

It is an amenable number.

651442561 is a deficient number, since it is larger than the sum of its proper divisors (179637887).

651442561 is a wasteful number, since it uses less digits than its factorization.

651442561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196812.

The product of its digits is 28800, while the sum is 34.

The square root of 651442561 is about 25523.3728374602. The cubic root of 651442561 is about 866.8794537837.

The spelling of 651442561 in words is "six hundred fifty-one million, four hundred forty-two thousand, five hundred sixty-one".