31381327 has 4 divisors (see below), whose sum is σ = 31392976. Its totient is φ = 31369680.

The previous prime is 31381307. The next prime is 31381349. The reversal of 31381327 is 72318313.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 31381327 - 2⁷ = 31381199 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31381295 and 31381304.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31381307) 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, 523 + ... + 7939.

It is an arithmetic number, because the mean of its divisors is an integer number (7848244).

Almost surely, 2^31381327 is an apocalyptic number.

31381327 is a deficient number, since it is larger than the sum of its proper divisors (11649).

31381327 is an equidigital number, since it uses as much as digits as its factorization.

31381327 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11648.

The product of its digits is 3024, while the sum is 28.

The square root of 31381327 is about 5601.9038727918. The cubic root of 31381327 is about 315.4208768981.

It can be divided in two parts, 3138 and 1327, that added together give a triangular number (4465 = T₉₄).

The spelling of 31381327 in words is "thirty-one million, three hundred eighty-one thousand, three hundred twenty-seven".