31321042091 has 2 divisors, whose sum is σ = 31321042092. Its totient is φ = 31321042090.

The previous prime is 31321042001. The next prime is 31321042111. The reversal of 31321042091 is 19024012313.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31321042091 - 2¹⁴ = 31321025707 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31321042091.

It is not a weakly prime, because it can be changed into another prime (31321042001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15660521045 + 15660521046.

It is an arithmetic number, because the mean of its divisors is an integer number (15660521046).

Almost surely, 2^31321042091 is an apocalyptic number.

31321042091 is a deficient number, since it is larger than the sum of its proper divisors (1).

31321042091 is an equidigital number, since it uses as much as digits as its factorization.

31321042091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 26.

The spelling of 31321042091 in words is "thirty-one billion, three hundred twenty-one million, forty-two thousand, ninety-one".