9315981 has 24 divisors (see below), whose sum is σ = 13927680. Its totient is φ = 5997600.

The previous prime is 9315973. The next prime is 9315991. The reversal of 9315981 is 1895139.

It is a happy number.

9315981 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 9315981 - 2³ = 9315973 is a prime.

It is a super-2 number, since 2×9315981² = 173575003984722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9315991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 38860 + ... + 39098.

It is an arithmetic number, because the mean of its divisors is an integer number (580320).

Almost surely, 2^9315981 is an apocalyptic number.

It is an amenable number.

9315981 is a deficient number, since it is larger than the sum of its proper divisors (4611699).

9315981 is a wasteful number, since it uses less digits than its factorization.

9315981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 377 (or 374 counting only the distinct ones).

The product of its digits is 9720, while the sum is 36.

The square root of 9315981 is about 3052.2091999075. The cubic root of 9315981 is about 210.4147585271.

It can be divided in two parts, 9315 and 981, that added together give a triangular number (10296 = T₁₄₃).

The spelling of 9315981 in words is "nine million, three hundred fifteen thousand, nine hundred eighty-one".