1231950859 has 2 divisors, whose sum is σ = 1231950860. Its totient is φ = 1231950858.

The previous prime is 1231950803. The next prime is 1231950893. The reversal of 1231950859 is 9580591321.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1231950859 - 2¹³ = 1231942667 is a prime.

It is not a weakly prime, because it can be changed into another prime (1231950059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615975429 + 615975430.

It is an arithmetic number, because the mean of its divisors is an integer number (615975430).

Almost surely, 2^1231950859 is an apocalyptic number.

1231950859 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231950859 is an equidigital number, since it uses as much as digits as its factorization.

1231950859 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 97200, while the sum is 43.

The square root of 1231950859 is about 35099.1575255019. The cubic root of 1231950859 is about 1072.0074286980.

The spelling of 1231950859 in words is "one billion, two hundred thirty-one million, nine hundred fifty thousand, eight hundred fifty-nine".