8187906961 has 16 divisors (see below), whose sum is σ = 9156768768. Its totient is φ = 7270401600.

The previous prime is 8187906941. The next prime is 8187906997. The reversal of 8187906961 is 1696097818.

It is a cyclic number.

It is not a de Polignac number, because 8187906961 - 2⁵ = 8187906929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8187906941) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6471 + ... + 128131.

It is an arithmetic number, because the mean of its divisors is an integer number (572298048).

Almost surely, 2^8187906961 is an apocalyptic number.

It is an amenable number.

8187906961 is a deficient number, since it is larger than the sum of its proper divisors (968861807).

8187906961 is a wasteful number, since it uses less digits than its factorization.

8187906961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121872.

The product of its (nonzero) digits is 1306368, while the sum is 55.

The square root of 8187906961 is about 90487.0541072036. The cubic root of 8187906961 is about 2015.5378878334.

The spelling of 8187906961 in words is "eight billion, one hundred eighty-seven million, nine hundred six thousand, nine hundred sixty-one".