31642013 has 4 divisors (see below), whose sum is σ = 34076028. Its totient is φ = 29208000.

The previous prime is 31642003. The next prime is 31642019. The reversal of 31642013 is 31024613.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31024613 = 157 ⋅197609.

It can be written as a sum of positive squares in 2 ways, for example, as 5866084 + 25775929 = 2422^2 + 5077^2 .

It is a cyclic number.

It is not a de Polignac number, because 31642013 - 2¹² = 31637917 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 (31642019) 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, 1216988 + ... + 1217013.

It is an arithmetic number, because the mean of its divisors is an integer number (8519007).

Almost surely, 2^31642013 is an apocalyptic number.

It is an amenable number.

31642013 is a deficient number, since it is larger than the sum of its proper divisors (2434015).

31642013 is a wasteful number, since it uses less digits than its factorization.

31642013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2434014.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 31642013 is about 5625.1233764247. The cubic root of 31642013 is about 316.2918743471.

Adding to 31642013 its reverse (31024613), we get a palindrome (62666626).

The spelling of 31642013 in words is "thirty-one million, six hundred forty-two thousand, thirteen".