1231860899 has 2 divisors, whose sum is σ = 1231860900. Its totient is φ = 1231860898.

The previous prime is 1231860853. The next prime is 1231860967. The reversal of 1231860899 is 9980681321.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1231860899 is a prime.

It is not a weakly prime, because it can be changed into another prime (1231860829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615930449 + 615930450.

It is an arithmetic number, because the mean of its divisors is an integer number (615930450).

Almost surely, 2^1231860899 is an apocalyptic number.

1231860899 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231860899 is an equidigital number, since it uses as much as digits as its factorization.

1231860899 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 186624, while the sum is 47.

The square root of 1231860899 is about 35097.8759898658. The cubic root of 1231860899 is about 1071.9813345468.

The spelling of 1231860899 in words is "one billion, two hundred thirty-one million, eight hundred sixty thousand, eight hundred ninety-nine".