31080881 has 8 divisors (see below), whose sum is σ = 33531624. Its totient is φ = 28638720.

The previous prime is 31080869. The next prime is 31080901. The reversal of 31080881 is 18808013.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 256 + 31080625 = 16^2 + 5575^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31080881 is a prime.

It is a super-2 number, since 2×31080881² = 1932042327472322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31080281) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6785 + ... + 10401.

It is an arithmetic number, because the mean of its divisors is an integer number (4191453).

Almost surely, 2^31080881 is an apocalyptic number.

It is an amenable number.

31080881 is a deficient number, since it is larger than the sum of its proper divisors (2450743).

31080881 is a wasteful number, since it uses less digits than its factorization.

31080881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4291.

The product of its (nonzero) digits is 1536, while the sum is 29.

The square root of 31080881 is about 5575.0229595940. The cubic root of 31080881 is about 314.4110301420.

Adding to 31080881 its reverse (18808013), we get a palindrome (49888894).

The spelling of 31080881 in words is "thirty-one million, eighty thousand, eight hundred eighty-one".