981231165 has 20 divisors (see below), whose sum is σ = 1758948444. Its totient is φ = 523323072.

The previous prime is 981231133. The next prime is 981231169. The reversal of 981231165 is 561132189.

It can be written as a sum of positive squares in 2 ways, for example, as 691584804 + 289646361 = 26298^2 + 17019^2 .

It is not a de Polignac number, because 981231165 - 2⁵ = 981231133 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (981231169) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1210992 + ... + 1211801.

Almost surely, 2^981231165 is an apocalyptic number.

It is an amenable number.

981231165 is a deficient number, since it is larger than the sum of its proper divisors (777717279).

981231165 is a wasteful number, since it uses less digits than its factorization.

981231165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2422810 (or 2422801 counting only the distinct ones).

The product of its digits is 12960, while the sum is 36.

The square root of 981231165 is about 31324.6095745821. The cubic root of 981231165 is about 993.7041673415.

The spelling of 981231165 in words is "nine hundred eighty-one million, two hundred thirty-one thousand, one hundred sixty-five".