31081051 has 4 divisors (see below), whose sum is σ = 31095400. Its totient is φ = 31066704.

The previous prime is 31081021. The next prime is 31081097. The reversal of 31081051 is 15018013.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15018013 = 41 ⋅366293.

It is a cyclic number.

It is not a de Polignac number, because 31081051 - 2⁵ = 31081019 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31081021) 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 3 ways as a sum of consecutive naturals, for example, 3186 + ... + 8503.

It is an arithmetic number, because the mean of its divisors is an integer number (7773850).

Almost surely, 2^31081051 is an apocalyptic number.

31081051 is a deficient number, since it is larger than the sum of its proper divisors (14349).

31081051 is a wasteful number, since it uses less digits than its factorization.

31081051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14348.

The product of its (nonzero) digits is 120, while the sum is 19.

The square root of 31081051 is about 5575.0382061471. The cubic root of 31081051 is about 314.4116033752.

Adding to 31081051 its reverse (15018013), we get a palindrome (46099064).

The spelling of 31081051 in words is "thirty-one million, eighty-one thousand, fifty-one".