31133081 has 16 divisors (see below), whose sum is σ = 36624000. Its totient is φ = 26452944.

The previous prime is 31133059. The next prime is 31133087. The reversal of 31133081 is 18033113.

It is a happy number.

It is not a de Polignac number, because 31133081 - 2⁶ = 31133017 is a prime.

It is a super-2 number, since 2×31133081² = 1938537465105122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31133087) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47351 + ... + 48003.

It is an arithmetic number, because the mean of its divisors is an integer number (2289000).

Almost surely, 2^31133081 is an apocalyptic number.

It is an amenable number.

31133081 is a deficient number, since it is larger than the sum of its proper divisors (5490919).

31133081 is an equidigital number, since it uses as much as digits as its factorization.

31133081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 813 (or 799 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 31133081 is about 5579.7025906405. The cubic root of 31133081 is about 314.5869483243.

Adding to 31133081 its reverse (18033113), we get a palindrome (49166194).

The spelling of 31133081 in words is "thirty-one million, one hundred thirty-three thousand, eighty-one".