31405013 has 4 divisors (see below), whose sum is σ = 31580640. Its totient is φ = 31229388.

The previous prime is 31404983. The next prime is 31405021. The reversal of 31405013 is 31050413.

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 31405013 - 2⁸ = 31404757 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31404982 and 31405000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31405063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87545 + ... + 87902.

It is an arithmetic number, because the mean of its divisors is an integer number (7895160).

Almost surely, 2^31405013 is an apocalyptic number.

It is an amenable number.

31405013 is a deficient number, since it is larger than the sum of its proper divisors (175627).

31405013 is a wasteful number, since it uses less digits than its factorization.

31405013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175626.

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 31405013 is about 5604.0175767033. The cubic root of 31405013 is about 315.5002147371.

Adding to 31405013 its reverse (31050413), we get a palindrome (62455426).

The spelling of 31405013 in words is "thirty-one million, four hundred five thousand, thirteen".