311921149 has 2 divisors, whose sum is σ = 311921150. Its totient is φ = 311921148.

The previous prime is 311921107. The next prime is 311921167. The reversal of 311921149 is 941129113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 246019225 + 65901924 = 15685^2 + 8118^2 .

It is a cyclic number.

It is not a de Polignac number, because 311921149 - 2⁷ = 311921021 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 311921149.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (311921549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155960574 + 155960575.

It is an arithmetic number, because the mean of its divisors is an integer number (155960575).

Almost surely, 2^311921149 is an apocalyptic number.

It is an amenable number.

311921149 is a deficient number, since it is larger than the sum of its proper divisors (1).

311921149 is an equidigital number, since it uses as much as digits as its factorization.

311921149 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1944, while the sum is 31.

The square root of 311921149 is about 17661.2895622035. The cubic root of 311921149 is about 678.1851469483.

The spelling of 311921149 in words is "three hundred eleven million, nine hundred twenty-one thousand, one hundred forty-nine".