311243137 has 2 divisors, whose sum is σ = 311243138. Its totient is φ = 311243136.

The previous prime is 311243099. The next prime is 311243143. The reversal of 311243137 is 731342113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 310323456 + 919681 = 17616^2 + 959^2 .

It is a cyclic number.

It is not a de Polignac number, because 311243137 - 2¹¹ = 311241089 is a prime.

It is not a weakly prime, because it can be changed into another prime (311247137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155621568 + 155621569.

It is an arithmetic number, because the mean of its divisors is an integer number (155621569).

Almost surely, 2^311243137 is an apocalyptic number.

It is an amenable number.

311243137 is a deficient number, since it is larger than the sum of its proper divisors (1).

311243137 is an equidigital number, since it uses as much as digits as its factorization.

311243137 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1512, while the sum is 25.

The square root of 311243137 is about 17642.0842589531. The cubic root of 311243137 is about 677.6934081062.

The spelling of 311243137 in words is "three hundred eleven million, two hundred forty-three thousand, one hundred thirty-seven".