331661149 has 2 divisors, whose sum is σ = 331661150. Its totient is φ = 331661148.

The previous prime is 331661137. The next prime is 331661191. The reversal of 331661149 is 941166133.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 321305625 + 10355524 = 17925^2 + 3218^2 .

It is a cyclic number.

It is not a de Polignac number, because 331661149 - 2¹⁷ = 331530077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (331661749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165830574 + 165830575.

It is an arithmetic number, because the mean of its divisors is an integer number (165830575).

Almost surely, 2^331661149 is an apocalyptic number.

It is an amenable number.

331661149 is a deficient number, since it is larger than the sum of its proper divisors (1).

331661149 is an equidigital number, since it uses as much as digits as its factorization.

331661149 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11664, while the sum is 34.

The square root of 331661149 is about 18211.5663521840. The cubic root of 331661149 is about 692.1999022918.

The spelling of 331661149 in words is "three hundred thirty-one million, six hundred sixty-one thousand, one hundred forty-nine".