31300091 has 2 divisors, whose sum is σ = 31300092. Its totient is φ = 31300090.

The previous prime is 31300081. The next prime is 31300099. The reversal of 31300091 is 19000313.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31300091 - 2¹⁸ = 31037947 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31300099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15650045 + 15650046.

It is an arithmetic number, because the mean of its divisors is an integer number (15650046).

Almost surely, 2^31300091 is an apocalyptic number.

31300091 is a deficient number, since it is larger than the sum of its proper divisors (1).

31300091 is an equidigital number, since it uses as much as digits as its factorization.

31300091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81, while the sum is 17.

The square root of 31300091 is about 5594.6484250576. The cubic root of 31300091 is about 315.1484678471.

The spelling of 31300091 in words is "thirty-one million, three hundred thousand, ninety-one".