31350081 has 32 divisors (see below), whose sum is σ = 50946048. Its totient is φ = 16758720.

The previous prime is 31350061. The next prime is 31350089. The reversal of 31350081 is 18005313.

It is a happy number.

It is not a de Polignac number, because 31350081 - 2⁵ = 31350049 is a prime.

It is a super-2 number, since 2×31350081² = 1965655157413122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (31350089) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22011 + ... + 23391.

It is an arithmetic number, because the mean of its divisors is an integer number (1592064).

Almost surely, 2^31350081 is an apocalyptic number.

It is an amenable number.

31350081 is a deficient number, since it is larger than the sum of its proper divisors (19595967).

31350081 is a wasteful number, since it uses less digits than its factorization.

31350081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1461.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 31350081 is about 5599.1143049593. The cubic root of 31350081 is about 315.3161552423.

Adding to 31350081 its reverse (18005313), we get a palindrome (49355394).

The spelling of 31350081 in words is "thirty-one million, three hundred fifty thousand, eighty-one".