31948121 has 2 divisors, whose sum is σ = 31948122. Its totient is φ = 31948120.

The previous prime is 31948069. The next prime is 31948123. The reversal of 31948121 is 12184913.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30958096 + 990025 = 5564^2 + 995^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31948121 is a prime.

Together with 31948123, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31948123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15974060 + 15974061.

It is an arithmetic number, because the mean of its divisors is an integer number (15974061).

Almost surely, 2^31948121 is an apocalyptic number.

It is an amenable number.

31948121 is a deficient number, since it is larger than the sum of its proper divisors (1).

31948121 is an equidigital number, since it uses as much as digits as its factorization.

31948121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1728, while the sum is 29.

The square root of 31948121 is about 5652.2668903724. The cubic root of 31948121 is about 317.3085493035.

The spelling of 31948121 in words is "thirty-one million, nine hundred forty-eight thousand, one hundred twenty-one".