31189841 has 2 divisors, whose sum is σ = 31189842. Its totient is φ = 31189840.

The previous prime is 31189801. The next prime is 31189843. The reversal of 31189841 is 14898113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22657600 + 8532241 = 4760^2 + 2921^2 .

It is a cyclic number.

It is not a de Polignac number, because 31189841 - 2¹⁸ = 30927697 is a prime.

It is a Sophie Germain prime.

Together with 31189843, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (31189843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15594920 + 15594921.

It is an arithmetic number, because the mean of its divisors is an integer number (15594921).

Almost surely, 2^31189841 is an apocalyptic number.

It is an amenable number.

31189841 is a deficient number, since it is larger than the sum of its proper divisors (1).

31189841 is an equidigital number, since it uses as much as digits as its factorization.

31189841 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6912, while the sum is 35.

The square root of 31189841 is about 5584.7865670946. The cubic root of 31189841 is about 314.7780110597.

The spelling of 31189841 in words is "thirty-one million, one hundred eighty-nine thousand, eight hundred forty-one".