31481379 has 12 divisors (see below), whose sum is σ = 47157656. Its totient is φ = 20987424.

The previous prime is 31481371. The next prime is 31481383. The reversal of 31481379 is 97318413.

It is a happy number.

It is not a de Polignac number, because 31481379 - 2³ = 31481371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31481371) 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, 64534 + ... + 65019.

Almost surely, 2^31481379 is an apocalyptic number.

31481379 is a deficient number, since it is larger than the sum of its proper divisors (15676277).

31481379 is an equidigital number, since it uses as much as digits as its factorization.

31481379 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129568 (or 129556 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 31481379 is about 5610.8269443996. The cubic root of 31481379 is about 315.7557364353.

The spelling of 31481379 in words is "thirty-one million, four hundred eighty-one thousand, three hundred seventy-nine".