8131978170 has 48 divisors (see below), whose sum is σ = 21171926880. Its totient is φ = 2165575392.

The previous prime is 8131978157. The next prime is 8131978199. The reversal of 8131978170 is 718791318.

It is a happy number.

It is a super-2 number, since 2×8131978170² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 5377 + ... + 127643.

It is an arithmetic number, because the mean of its divisors is an integer number (441081810).

Almost surely, 2^8131978170 is an apocalyptic number.

8131978170 is an abundant number, since it is smaller than the sum of its proper divisors (13039948710).

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

8131978170 is a wasteful number, since it uses less digits than its factorization.

8131978170 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123019 (or 123016 counting only the distinct ones).

The product of its (nonzero) digits is 84672, while the sum is 45.

The square root of 8131978170 is about 90177.4815017585. The cubic root of 8131978170 is about 2010.9382491272.

The spelling of 8131978170 in words is "eight billion, one hundred thirty-one million, nine hundred seventy-eight thousand, one hundred seventy".