311204989 has 2 divisors, whose sum is σ = 311204990. Its totient is φ = 311204988.

The previous prime is 311204983. The next prime is 311205023. The reversal of 311204989 is 989402113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 238239225 + 72965764 = 15435^2 + 8542^2 .

It is a cyclic number.

It is not a de Polignac number, because 311204989 - 2²¹ = 309107837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (311204983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155602494 + 155602495.

It is an arithmetic number, because the mean of its divisors is an integer number (155602495).

Almost surely, 2^311204989 is an apocalyptic number.

It is an amenable number.

311204989 is a deficient number, since it is larger than the sum of its proper divisors (1).

311204989 is an equidigital number, since it uses as much as digits as its factorization.

311204989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 311204989 is about 17641.0030610507. The cubic root of 311204989 is about 677.6657194588.

The spelling of 311204989 in words is "three hundred eleven million, two hundred four thousand, nine hundred eighty-nine".