1231502541979 has 2 divisors, whose sum is σ = 1231502541980. Its totient is φ = 1231502541978.

The previous prime is 1231502541947. The next prime is 1231502542027. The reversal of 1231502541979 is 9791452051321.

It is a weak prime.

It is an emirp because it is prime and its reverse (9791452051321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1231502541979 - 2⁵ = 1231502541947 is a prime.

It is not a weakly prime, because it can be changed into another prime (1231502541679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615751270989 + 615751270990.

It is an arithmetic number, because the mean of its divisors is an integer number (615751270990).

Almost surely, 2^{1231502541979} is an apocalyptic number.

1231502541979 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231502541979 is an equidigital number, since it uses as much as digits as its factorization.

1231502541979 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 680400, while the sum is 49.

The spelling of 1231502541979 in words is "one trillion, two hundred thirty-one billion, five hundred two million, five hundred forty-one thousand, nine hundred seventy-nine".