240231391 has 2 divisors, whose sum is σ = 240231392. Its totient is φ = 240231390.

The previous prime is 240231373. The next prime is 240231427. The reversal of 240231391 is 193132042.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 240231391 - 2⁷ = 240231263 is a prime.

It is a super-2 number, since 2×240231391² = 115422242443589762, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (240231311) 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, 120115695 + 120115696.

It is an arithmetic number, because the mean of its divisors is an integer number (120115696).

Almost surely, 2^240231391 is an apocalyptic number.

240231391 is a deficient number, since it is larger than the sum of its proper divisors (1).

240231391 is an equidigital number, since it uses as much as digits as its factorization.

240231391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 240231391 is about 15499.3996980528. The cubic root of 240231391 is about 621.6461552728.

The spelling of 240231391 in words is "two hundred forty million, two hundred thirty-one thousand, three hundred ninety-one".