31132081 has 4 divisors (see below), whose sum is σ = 31162432. Its totient is φ = 31101732.

The previous prime is 31132067. The next prime is 31132093. The reversal of 31132081 is 18023113.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 31132081 - 2⁷ = 31131953 is a prime.

It is a super-2 number, since 2×31132081² = 1938412934781122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31132481) 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, 13581 + ... + 15706.

It is an arithmetic number, because the mean of its divisors is an integer number (7790608).

Almost surely, 2^31132081 is an apocalyptic number.

It is an amenable number.

31132081 is a deficient number, since it is larger than the sum of its proper divisors (30351).

31132081 is a wasteful number, since it uses less digits than its factorization.

31132081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30350.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 31132081 is about 5579.6129794100. The cubic root of 31132081 is about 314.5835800923.

Adding to 31132081 its reverse (18023113), we get a palindrome (49155194).

The spelling of 31132081 in words is "thirty-one million, one hundred thirty-two thousand, eighty-one".