311971489 has 2 divisors, whose sum is σ = 311971490. Its totient is φ = 311971488.

The previous prime is 311971463. The next prime is 311971537. The reversal of 311971489 is 984179113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 282811489 + 29160000 = 16817^2 + 5400^2 .

It is a cyclic number.

It is not a de Polignac number, because 311971489 - 2¹³ = 311963297 is a prime.

It is equal to p_16865197 and since 311971489 and 16865197 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (311171489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155985744 + 155985745.

It is an arithmetic number, because the mean of its divisors is an integer number (155985745).

Almost surely, 2^311971489 is an apocalyptic number.

It is an amenable number.

311971489 is a deficient number, since it is larger than the sum of its proper divisors (1).

311971489 is an equidigital number, since it uses as much as digits as its factorization.

311971489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54432, while the sum is 43.

The square root of 311971489 is about 17662.7146554543. The cubic root of 311971489 is about 678.2216283946.

The spelling of 311971489 in words is "three hundred eleven million, nine hundred seventy-one thousand, four hundred eighty-nine".