231777149 has 2 divisors, whose sum is σ = 231777150. Its totient is φ = 231777148.

The previous prime is 231777137. The next prime is 231777151. The reversal of 231777149 is 941777132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 175377049 + 56400100 = 13243^2 + 7510^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231777149 is a prime.

Together with 231777151, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231777199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115888574 + 115888575.

It is an arithmetic number, because the mean of its divisors is an integer number (115888575).

Almost surely, 2^231777149 is an apocalyptic number.

It is an amenable number.

231777149 is a deficient number, since it is larger than the sum of its proper divisors (1).

231777149 is an equidigital number, since it uses as much as digits as its factorization.

231777149 is an evil number, because the sum of its binary digits is even.

The product of its digits is 74088, while the sum is 41.

The square root of 231777149 is about 15224.2290116774. The cubic root of 231777149 is about 614.2665581783.

The spelling of 231777149 in words is "two hundred thirty-one million, seven hundred seventy-seven thousand, one hundred forty-nine".