31661593 has 4 divisors (see below), whose sum is σ = 33038208. Its totient is φ = 30284980.

The previous prime is 31661579. The next prime is 31661611. The reversal of 31661593 is 39516613.

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 31661593 - 2⁵ = 31661561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31661573) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 688273 + ... + 688318.

It is an arithmetic number, because the mean of its divisors is an integer number (8259552).

Almost surely, 2^31661593 is an apocalyptic number.

It is an amenable number.

31661593 is a deficient number, since it is larger than the sum of its proper divisors (1376615).

31661593 is a wasteful number, since it uses less digits than its factorization.

31661593 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1376614.

The product of its digits is 14580, while the sum is 34.

The square root of 31661593 is about 5626.8635135393. The cubic root of 31661593 is about 316.3571011068.

The spelling of 31661593 in words is "thirty-one million, six hundred sixty-one thousand, five hundred ninety-three".