931213381 has 4 divisors (see below), whose sum is σ = 1064243872. Its totient is φ = 798182892.

The previous prime is 931213379. The next prime is 931213417. The reversal of 931213381 is 183312139.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 931213381 - 2¹ = 931213379 is a prime.

It is a super-2 number, since 2×931213381² = 1734316721906902322, 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 (931213321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66515235 + ... + 66515248.

It is an arithmetic number, because the mean of its divisors is an integer number (266060968).

Almost surely, 2^931213381 is an apocalyptic number.

It is an amenable number.

931213381 is a deficient number, since it is larger than the sum of its proper divisors (133030491).

931213381 is a wasteful number, since it uses less digits than its factorization.

931213381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133030490.

The product of its digits is 3888, while the sum is 31.

The square root of 931213381 is about 30515.7890443619. The cubic root of 931213381 is about 976.5243325735.

The spelling of 931213381 in words is "nine hundred thirty-one million, two hundred thirteen thousand, three hundred eighty-one".