31346981 has 4 divisors (see below), whose sum is σ = 31398732. Its totient is φ = 31295232.

The previous prime is 31346971. The next prime is 31346989. The reversal of 31346981 is 18964313.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12285025 + 19061956 = 3505^2 + 4366^2 .

It is a cyclic number.

It is not a de Polignac number, because 31346981 - 2¹⁰ = 31345957 is a prime.

It is a super-2 number, since 2×31346981² = 1965266435628722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31346989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24956 + ... + 26181.

It is an arithmetic number, because the mean of its divisors is an integer number (7849683).

Almost surely, 2^31346981 is an apocalyptic number.

It is an amenable number.

31346981 is a deficient number, since it is larger than the sum of its proper divisors (51751).

31346981 is an equidigital number, since it uses as much as digits as its factorization.

31346981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51750.

The product of its digits is 15552, while the sum is 35.

The square root of 31346981 is about 5598.8374686179. The cubic root of 31346981 is about 315.3057617305.

The spelling of 31346981 in words is "thirty-one million, three hundred forty-six thousand, nine hundred eighty-one".