311142889 has 2 divisors, whose sum is σ = 311142890. Its totient is φ = 311142888.

The previous prime is 311142869. The next prime is 311142989. The reversal of 311142889 is 988241113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 268697664 + 42445225 = 16392^2 + 6515^2 .

It is an emirp because it is prime and its reverse (988241113) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 311142889 - 2²³ = 302754281 is a prime.

It is not a weakly prime, because it can be changed into another prime (311142829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155571444 + 155571445.

It is an arithmetic number, because the mean of its divisors is an integer number (155571445).

Almost surely, 2^311142889 is an apocalyptic number.

It is an amenable number.

311142889 is a deficient number, since it is larger than the sum of its proper divisors (1).

311142889 is an equidigital number, since it uses as much as digits as its factorization.

311142889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13824, while the sum is 37.

The square root of 311142889 is about 17639.2428692390. The cubic root of 311142889 is about 677.6206410891.

The spelling of 311142889 in words is "three hundred eleven million, one hundred forty-two thousand, eight hundred eighty-nine".