31160081 has 8 divisors (see below), whose sum is σ = 31843944. Its totient is φ = 30481920.

The previous prime is 31160071. The next prime is 31160111. The reversal of 31160081 is 18006113.

It can be written as a sum of positive squares in 4 ways, for example, as 6250000 + 24910081 = 2500^2 + 4991^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 31160081 - 2²² = 26965777 is a prime.

It is a super-2 number, since 2×31160081² = 1941901295853122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31160011) 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, 10721 + ... + 13313.

It is an arithmetic number, because the mean of its divisors is an integer number (3980493).

Almost surely, 2^31160081 is an apocalyptic number.

It is an amenable number.

31160081 is a deficient number, since it is larger than the sum of its proper divisors (683863).

31160081 is a wasteful number, since it uses less digits than its factorization.

31160081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2851.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 31160081 is about 5582.1215500919. The cubic root of 31160081 is about 314.6778633371.

Adding to 31160081 its reverse (18006113), we get a palindrome (49166194).

The spelling of 31160081 in words is "thirty-one million, one hundred sixty thousand, eighty-one".