31346381 has 10 divisors (see below), whose sum is σ = 34496910. Its totient is φ = 28483400.

The previous prime is 31346377. The next prime is 31346407. The reversal of 31346381 is 18364313.

It can be written as a sum of positive squares in only one way, i.e., 30980356 + 366025 = 5566^2 + 605^2 .

It is not a de Polignac number, because 31346381 - 2² = 31346377 is a prime.

It is a super-2 number, since 2×31346381² = 1965191203594322, 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 (31340381) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 13571 + ... + 15711.

It is an arithmetic number, because the mean of its divisors is an integer number (3449691).

Almost surely, 2^31346381 is an apocalyptic number.

It is an amenable number.

31346381 is a deficient number, since it is larger than the sum of its proper divisors (3150529).

31346381 is an frugal number, since it uses more digits than its factorization.

31346381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2185 (or 2152 counting only the distinct ones).

The product of its digits is 5184, while the sum is 29.

The square root of 31346381 is about 5598.7838858095. The cubic root of 31346381 is about 315.3037500040.

The spelling of 31346381 in words is "thirty-one million, three hundred forty-six thousand, three hundred eighty-one".