31606013 has 4 divisors (see below), whose sum is σ = 31747968. Its totient is φ = 31464060.

The previous prime is 31605983. The next prime is 31606049. The reversal of 31606013 is 31060613.

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, and also an emirpimes, since its reverse is a distinct semiprime: 31060613 = 937 ⋅33149.

It is a cyclic number.

It is not a de Polignac number, because 31606013 - 2⁸ = 31605757 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 (31606313) 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, 70643 + ... + 71088.

It is an arithmetic number, because the mean of its divisors is an integer number (7936992).

Almost surely, 2^31606013 is an apocalyptic number.

It is an amenable number.

31606013 is a deficient number, since it is larger than the sum of its proper divisors (141955).

31606013 is a wasteful number, since it uses less digits than its factorization.

31606013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141954.

The product of its (nonzero) digits is 324, while the sum is 20.

The square root of 31606013 is about 5621.9225359302. The cubic root of 31606013 is about 316.1718774677.

Adding to 31606013 its reverse (31060613), we get a palindrome (62666626).

The spelling of 31606013 in words is "thirty-one million, six hundred six thousand, thirteen".