311681449 has 2 divisors, whose sum is σ = 311681450. Its totient is φ = 311681448.

The previous prime is 311681437. The next prime is 311681543. The reversal of 311681449 is 944186113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 244359424 + 67322025 = 15632^2 + 8205^2 .

It is a cyclic number.

It is not a de Polignac number, because 311681449 - 2²³ = 303292841 is a prime.

It is not a weakly prime, because it can be changed into another prime (311681429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155840724 + 155840725.

It is an arithmetic number, because the mean of its divisors is an integer number (155840725).

Almost surely, 2^311681449 is an apocalyptic number.

It is an amenable number.

311681449 is a deficient number, since it is larger than the sum of its proper divisors (1).

311681449 is an equidigital number, since it uses as much as digits as its factorization.

311681449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 37.

The square root of 311681449 is about 17654.5022303094. The cubic root of 311681449 is about 678.0113822658.

The spelling of 311681449 in words is "three hundred eleven million, six hundred eighty-one thousand, four hundred forty-nine".