1231858907 has 2 divisors, whose sum is σ = 1231858908. Its totient is φ = 1231858906.

The previous prime is 1231858877. The next prime is 1231858921. The reversal of 1231858907 is 7098581321.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1231858907 - 2¹⁶ = 1231793371 is a prime.

It is not a weakly prime, because it can be changed into another prime (1231858937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615929453 + 615929454.

It is an arithmetic number, because the mean of its divisors is an integer number (615929454).

Almost surely, 2^1231858907 is an apocalyptic number.

1231858907 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231858907 is an equidigital number, since it uses as much as digits as its factorization.

1231858907 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120960, while the sum is 44.

The square root of 1231858907 is about 35097.8476120687. The cubic root of 1231858907 is about 1071.9807567251.

The spelling of 1231858907 in words is "one billion, two hundred thirty-one million, eight hundred fifty-eight thousand, nine hundred seven".