3161861988 has 24 divisors (see below), whose sum is σ = 7615668480. Its totient is φ = 1019955360.

The previous prime is 3161861987. The next prime is 3161862001. The reversal of 3161861988 is 8891681613.

It is a self number, because there is not a number n which added to its sum of digits gives 3161861988.

It is not an unprimeable number, because it can be changed into a prime (3161861987) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4249443 + ... + 4250186.

It is an arithmetic number, because the mean of its divisors is an integer number (317319520).

Almost surely, 2^3161861988 is an apocalyptic number.

It is an amenable number.

3161861988 is an abundant number, since it is smaller than the sum of its proper divisors (4453806492).

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

3161861988 is a wasteful number, since it uses less digits than its factorization.

3161861988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8499667 (or 8499665 counting only the distinct ones).

The product of its digits is 497664, while the sum is 51.

The square root of 3161861988 is about 56230.4364912811. The cubic root of 3161861988 is about 1467.7349521608.

The spelling of 3161861988 in words is "three billion, one hundred sixty-one million, eight hundred sixty-one thousand, nine hundred eighty-eight".