31326381 has 12 divisors (see below), whose sum is σ = 45479200. Its totient is φ = 20778120.

The previous prime is 31326377. The next prime is 31326389. The reversal of 31326381 is 18362313.

It is a happy number.

It is not a de Polignac number, because 31326381 - 2² = 31326377 is a prime.

It is a super-2 number, since 2×31326381² = 1962684293114322, 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 (31326389) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6955 + ... + 10536.

Almost surely, 2^31326381 is an apocalyptic number.

It is an amenable number.

31326381 is a deficient number, since it is larger than the sum of its proper divisors (14152819).

31326381 is a wasteful number, since it uses less digits than its factorization.

31326381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17696 (or 17693 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 31326381 is about 5596.9974986594. The cubic root of 31326381 is about 315.2366777569.

Adding to 31326381 its reverse (18362313), we get a palindrome (49688694).

The spelling of 31326381 in words is "thirty-one million, three hundred twenty-six thousand, three hundred eighty-one".