8921807961 has 32 divisors (see below), whose sum is σ = 13790383488. Its totient is φ = 5070627840.

The previous prime is 8921807959. The next prime is 8921807963. The reversal of 8921807961 is 1697081298.

It is an interprime number because it is at equal distance from previous prime (8921807959) and next prime (8921807963).

It is not a de Polignac number, because 8921807961 - 2¹ = 8921807959 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (8921807963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 126691 + ... + 184103.

It is an arithmetic number, because the mean of its divisors is an integer number (430949484).

Almost surely, 2^8921807961 is an apocalyptic number.

It is an amenable number.

8921807961 is a deficient number, since it is larger than the sum of its proper divisors (4868575527).

8921807961 is a wasteful number, since it uses less digits than its factorization.

8921807961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57721.

The product of its (nonzero) digits is 435456, while the sum is 51.

The square root of 8921807961 is about 94455.3225657506. The cubic root of 8921807961 is about 2074.0423673046.

The spelling of 8921807961 in words is "eight billion, nine hundred twenty-one million, eight hundred seven thousand, nine hundred sixty-one".