1231233149 has 2 divisors, whose sum is σ = 1231233150. Its totient is φ = 1231233148.

The previous prime is 1231233131. The next prime is 1231233151. The reversal of 1231233149 is 9413321321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1178205625 + 53027524 = 34325^2 + 7282^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1231233149 is a prime.

Together with 1231233151, 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 (1231233049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615616574 + 615616575.

It is an arithmetic number, because the mean of its divisors is an integer number (615616575).

Almost surely, 2^1231233149 is an apocalyptic number.

It is an amenable number.

1231233149 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231233149 is an equidigital number, since it uses as much as digits as its factorization.

1231233149 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3888, while the sum is 29.

The square root of 1231233149 is about 35088.9320014161. The cubic root of 1231233149 is about 1071.7992115425.

The spelling of 1231233149 in words is "one billion, two hundred thirty-one million, two hundred thirty-three thousand, one hundred forty-nine".