31204091 has 2 divisors, whose sum is σ = 31204092. Its totient is φ = 31204090.

The previous prime is 31204067. The next prime is 31204093. The reversal of 31204091 is 19040213.

It is a strong prime.

It is an emirp because it is prime and its reverse (19040213) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31204091 - 2¹⁸ = 30941947 is a prime.

Together with 31204093, 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 (31204093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15602045 + 15602046.

It is an arithmetic number, because the mean of its divisors is an integer number (15602046).

Almost surely, 2^31204091 is an apocalyptic number.

31204091 is a deficient number, since it is larger than the sum of its proper divisors (1).

31204091 is an equidigital number, since it uses as much as digits as its factorization.

31204091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 31204091 is about 5586.0622087478. The cubic root of 31204091 is about 314.8259423044.

The spelling of 31204091 in words is "thirty-one million, two hundred four thousand, ninety-one".