1231510199 has 2 divisors, whose sum is σ = 1231510200. Its totient is φ = 1231510198.

The previous prime is 1231510193. The next prime is 1231510207. The reversal of 1231510199 is 9910151321.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1231510199 - 2²⁰ = 1230461623 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1231510193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615755099 + 615755100.

It is an arithmetic number, because the mean of its divisors is an integer number (615755100).

Almost surely, 2^1231510199 is an apocalyptic number.

1231510199 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231510199 is an equidigital number, since it uses as much as digits as its factorization.

1231510199 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2430, while the sum is 32.

The square root of 1231510199 is about 35092.8796054128. The cubic root of 1231510199 is about 1071.8795969951.

The spelling of 1231510199 in words is "one billion, two hundred thirty-one million, five hundred ten thousand, one hundred ninety-nine".