31305013 has 4 divisors (see below), whose sum is σ = 31772320. Its totient is φ = 30837708.

The previous prime is 31305011. The next prime is 31305019. The reversal of 31305013 is 31050313.

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 31305013 - 2¹ = 31305011 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31305011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 233553 + ... + 233686.

It is an arithmetic number, because the mean of its divisors is an integer number (7943080).

Almost surely, 2^31305013 is an apocalyptic number.

It is an amenable number.

31305013 is a deficient number, since it is larger than the sum of its proper divisors (467307).

31305013 is an equidigital number, since it uses as much as digits as its factorization.

31305013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 467306.

The product of its (nonzero) digits is 135, while the sum is 16.

The square root of 31305013 is about 5595.0882924222. The cubic root of 31305013 is about 315.1649862171.

Adding to 31305013 its reverse (31050313), we get a palindrome (62355326).

The spelling of 31305013 in words is "thirty-one million, three hundred five thousand, thirteen".