311140231 has 2 divisors, whose sum is σ = 311140232. Its totient is φ = 311140230.

The previous prime is 311140223. The next prime is 311140243. The reversal of 311140231 is 132041113.

It is a weak prime.

It is an emirp because it is prime and its reverse (132041113) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 311140231 - 2³ = 311140223 is a prime.

It is a super-2 number, since 2×311140231² = 193616486693466722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (311141231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155570115 + 155570116.

It is an arithmetic number, because the mean of its divisors is an integer number (155570116).

Almost surely, 2^311140231 is an apocalyptic number.

311140231 is a deficient number, since it is larger than the sum of its proper divisors (1).

311140231 is an equidigital number, since it uses as much as digits as its factorization.

311140231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 311140231 is about 17639.1675257082. The cubic root of 311140231 is about 677.6187115139.

Adding to 311140231 its reverse (132041113), we get a palindrome (443181344).

The spelling of 311140231 in words is "three hundred eleven million, one hundred forty thousand, two hundred thirty-one".