31948909 has 4 divisors (see below), whose sum is σ = 33338016. Its totient is φ = 30559804.

The previous prime is 31948907. The next prime is 31948921. The reversal of 31948909 is 90984913.

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 31948909 - 2¹ = 31948907 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 (31948901) 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, 694519 + ... + 694564.

It is an arithmetic number, because the mean of its divisors is an integer number (8334504).

Almost surely, 2^31948909 is an apocalyptic number.

It is an amenable number.

31948909 is a deficient number, since it is larger than the sum of its proper divisors (1389107).

31948909 is a wasteful number, since it uses less digits than its factorization.

31948909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1389106.

The product of its (nonzero) digits is 69984, while the sum is 43.

The square root of 31948909 is about 5652.3365964882. The cubic root of 31948909 is about 317.3111580859.

The spelling of 31948909 in words is "thirty-one million, nine hundred forty-eight thousand, nine hundred nine".