31103013 has 32 divisors (see below), whose sum is σ = 46006272. Its totient is φ = 18604800.

The previous prime is 31102999. The next prime is 31103021. The reversal of 31103013 is 31030113.

It is not a de Polignac number, because 31103013 - 2⁶ = 31102949 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31103013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31103053) 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, 162748 + ... + 162938.

It is an arithmetic number, because the mean of its divisors is an integer number (1437696).

Almost surely, 2^31103013 is an apocalyptic number.

It is an amenable number.

31103013 is a deficient number, since it is larger than the sum of its proper divisors (14903259).

31103013 is a wasteful number, since it uses less digits than its factorization.

31103013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345.

The product of its (nonzero) digits is 27, while the sum is 12.

The square root of 31103013 is about 5577.0075309255. The cubic root of 31103013 is about 314.4856407887.

Adding to 31103013 its reverse (31030113), we get a palindrome (62133126).

Subtracting from 31103013 its reverse (31030113), we obtain a square (72900 = 270²).

The spelling of 31103013 in words is "thirty-one million, one hundred three thousand, thirteen".