1231023149 has 2 divisors, whose sum is σ = 1231023150. Its totient is φ = 1231023148.

The previous prime is 1231023133. The next prime is 1231023161. The reversal of 1231023149 is 9413201321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 822255625 + 408767524 = 28675^2 + 20218^2 .

It is a cyclic number.

It is not a de Polignac number, because 1231023149 - 2⁴ = 1231023133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1231023649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615511574 + 615511575.

It is an arithmetic number, because the mean of its divisors is an integer number (615511575).

Almost surely, 2^1231023149 is an apocalyptic number.

It is an amenable number.

1231023149 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231023149 is an equidigital number, since it uses as much as digits as its factorization.

1231023149 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 1231023149 is about 35085.9394772322. The cubic root of 1231023149 is about 1071.7382724663.

The spelling of 1231023149 in words is "one billion, two hundred thirty-one million, twenty-three thousand, one hundred forty-nine".