32311891 has 2 divisors, whose sum is σ = 32311892. Its totient is φ = 32311890.

The previous prime is 32311879. The next prime is 32311901. The reversal of 32311891 is 19811323.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 32311891 - 2²³ = 23923283 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (32311831) 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 as a sum of consecutive naturals, namely, 16155945 + 16155946.

It is an arithmetic number, because the mean of its divisors is an integer number (16155946).

Almost surely, 2^32311891 is an apocalyptic number.

32311891 is a deficient number, since it is larger than the sum of its proper divisors (1).

32311891 is an equidigital number, since it uses as much as digits as its factorization.

32311891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1296, while the sum is 28.

The square root of 32311891 is about 5684.3549326199. The cubic root of 32311891 is about 318.5083275911.

The spelling of 32311891 in words is "thirty-two million, three hundred eleven thousand, eight hundred ninety-one".