31969993 has 4 divisors (see below), whose sum is σ = 34876368. Its totient is φ = 29063620.

The previous prime is 31969991. The next prime is 31969997. The reversal of 31969993 is 39996913.

It is a happy number.

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 31969993 - 2¹ = 31969991 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31969991) 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, 1453171 + ... + 1453192.

It is an arithmetic number, because the mean of its divisors is an integer number (8719092).

Almost surely, 2^31969993 is an apocalyptic number.

It is an amenable number.

31969993 is a deficient number, since it is larger than the sum of its proper divisors (2906375).

31969993 is a wasteful number, since it uses less digits than its factorization.

31969993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2906374.

The product of its digits is 354294, while the sum is 49.

The square root of 31969993 is about 5654.2013582822. The cubic root of 31969993 is about 317.3809436437.

The spelling of 31969993 in words is "thirty-one million, nine hundred sixty-nine thousand, nine hundred ninety-three".