31969613 has 4 divisors (see below), whose sum is σ = 34428828. Its totient is φ = 29510400.

The previous prime is 31969607. The next prime is 31969643. The reversal of 31969613 is 31696913.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31696913 = 29 ⋅1092997.

It can be written as a sum of positive squares in 2 ways, for example, as 8369449 + 23600164 = 2893^2 + 4858^2 .

It is a cyclic number.

It is not a de Polignac number, because 31969613 - 2¹⁰ = 31968589 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 (31969603) 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, 1229588 + ... + 1229613.

It is an arithmetic number, because the mean of its divisors is an integer number (8607207).

Almost surely, 2^31969613 is an apocalyptic number.

It is an amenable number.

31969613 is a deficient number, since it is larger than the sum of its proper divisors (2459215).

31969613 is a wasteful number, since it uses less digits than its factorization.

31969613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2459214.

The product of its digits is 26244, while the sum is 38.

The square root of 31969613 is about 5654.1677548513. The cubic root of 31969613 is about 317.3796861600.

The spelling of 31969613 in words is "thirty-one million, nine hundred sixty-nine thousand, six hundred thirteen".