31793131 has 2 divisors, whose sum is σ = 31793132. Its totient is φ = 31793130.

The previous prime is 31793087. The next prime is 31793141. The reversal of 31793131 is 13139713.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31793131 - 2⁹ = 31792619 is a prime.

It is a super-2 number, since 2×31793131² = 2021606357566322, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31793131.

It is not a weakly prime, because it can be changed into another prime (31793141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15896565 + 15896566.

It is an arithmetic number, because the mean of its divisors is an integer number (15896566).

Almost surely, 2^31793131 is an apocalyptic number.

31793131 is a deficient number, since it is larger than the sum of its proper divisors (1).

31793131 is an equidigital number, since it uses as much as digits as its factorization.

31793131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1701, while the sum is 28.

The square root of 31793131 is about 5638.5397932443. The cubic root of 31793131 is about 316.7945973713.

The spelling of 31793131 in words is "thirty-one million, seven hundred ninety-three thousand, one hundred thirty-one".