651661001 has 16 divisors (see below), whose sum is σ = 719832960. Its totient is φ = 587811840.

The previous prime is 651660973. The next prime is 651661027. The reversal of 651661001 is 100166156.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-651661001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (651661201) 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 15 ways as a sum of consecutive naturals, for example, 17321 + ... + 40041.

It is an arithmetic number, because the mean of its divisors is an integer number (44989560).

Almost surely, 2^651661001 is an apocalyptic number.

It is an amenable number.

651661001 is a deficient number, since it is larger than the sum of its proper divisors (68171959).

651661001 is a wasteful number, since it uses less digits than its factorization.

651661001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22816.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 651661001 is about 25527.6516938006. The cubic root of 651661001 is about 866.9763361991.

The spelling of 651661001 in words is "six hundred fifty-one million, six hundred sixty-one thousand, one".