31140191 has 2 divisors, whose sum is σ = 31140192. Its totient is φ = 31140190.

The previous prime is 31140157. The next prime is 31140233. The reversal of 31140191 is 19104113.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31140191 - 2¹⁸ = 30878047 is a prime.

It is a super-2 number, since 2×31140191² = 1939422991032962, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31140391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15570095 + 15570096.

It is an arithmetic number, because the mean of its divisors is an integer number (15570096).

Almost surely, 2^31140191 is an apocalyptic number.

31140191 is a deficient number, since it is larger than the sum of its proper divisors (1).

31140191 is an equidigital number, since it uses as much as digits as its factorization.

31140191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108, while the sum is 20.

The square root of 31140191 is about 5580.3396850013. The cubic root of 31140191 is about 314.6108943744.

The spelling of 31140191 in words is "thirty-one million, one hundred forty thousand, one hundred ninety-one".