981931 has 8 divisors (see below), whose sum is σ = 1016064. Its totient is φ = 948480.

The previous prime is 981919. The next prime is 981941. The reversal of 981931 is 139189.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 981931 - 2⁹ = 981419 is a prime.

It is a super-2 number, since 2×981931² = 1928376977522, which contains 22 as substring.

It is a Duffinian number.

981931 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 981893 and 981902.

It is not an unprimeable number, because it can be changed into a prime (981941) 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, 5046 + ... + 5236.

It is an arithmetic number, because the mean of its divisors is an integer number (127008).

2⁹⁸¹⁹³¹ is an apocalyptic number.

981931 is a deficient number, since it is larger than the sum of its proper divisors (34133).

981931 is a wasteful number, since it uses less digits than its factorization.

981931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 341.

The product of its digits is 1944, while the sum is 31.

The square root of 981931 is about 990.9243159798. The cubic root of 981931 is about 99.3940354870.

The spelling of 981931 in words is "nine hundred eighty-one thousand, nine hundred thirty-one".