31081047 has 8 divisors (see below), whose sum is σ = 41614320. Its totient is φ = 20634240.

The previous prime is 31081021. The next prime is 31081097. The reversal of 31081047 is 74018013.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 31081047 - 2⁶ = 31080983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31081097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20772 + ... + 22217.

It is an arithmetic number, because the mean of its divisors is an integer number (5201790).

Almost surely, 2^31081047 is an apocalyptic number.

31081047 is a deficient number, since it is larger than the sum of its proper divisors (10533273).

31081047 is a wasteful number, since it uses less digits than its factorization.

31081047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43233.

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 31081047 is about 5575.0378474052. The cubic root of 31081047 is about 314.4115898874.

The spelling of 31081047 in words is "thirty-one million, eighty-one thousand, forty-seven".