31551113 has 6 divisors (see below), whose sum is σ = 34680282. Its totient is φ = 28682720.

The previous prime is 31551097. The next prime is 31551137. The reversal of 31551113 is 31115513.

It can be written as a sum of positive squares in only one way, i.e., 30614089 + 937024 = 5533^2 + 968^2 .

It is not a de Polignac number, because 31551113 - 2⁴ = 31551097 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (31551173) 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 5 ways as a sum of consecutive naturals, for example, 130256 + ... + 130497.

It is an arithmetic number, because the mean of its divisors is an integer number (5780047).

Almost surely, 2^31551113 is an apocalyptic number.

It is an amenable number.

31551113 is a deficient number, since it is larger than the sum of its proper divisors (3129169).

31551113 is a wasteful number, since it uses less digits than its factorization.

31551113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260775 (or 260764 counting only the distinct ones).

The product of its digits is 225, while the sum is 20.

The square root of 31551113 is about 5617.0377424404. The cubic root of 31551113 is about 315.9887066679.

Adding to 31551113 its reverse (31115513), we get a palindrome (62666626).

Subtracting from 31551113 its reverse (31115513), we obtain a square (435600 = 660²).

The spelling of 31551113 in words is "thirty-one million, five hundred fifty-one thousand, one hundred thirteen".