31948421 has 4 divisors (see below), whose sum is σ = 32264844. Its totient is φ = 31632000.

The previous prime is 31948409. The next prime is 31948463. The reversal of 31948421 is 12484913.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 31024900 + 923521 = 5570^2 + 961^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31948421 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 (31948121) 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, 158060 + ... + 158261.

It is an arithmetic number, because the mean of its divisors is an integer number (8066211).

Almost surely, 2^31948421 is an apocalyptic number.

It is an amenable number.

31948421 is a deficient number, since it is larger than the sum of its proper divisors (316423).

31948421 is a wasteful number, since it uses less digits than its factorization.

31948421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 316422.

The product of its digits is 6912, while the sum is 32.

The square root of 31948421 is about 5652.2934283351. The cubic root of 31948421 is about 317.3095424998.

The spelling of 31948421 in words is "thirty-one million, nine hundred forty-eight thousand, four hundred twenty-one".