1242498843991 has 2 divisors, whose sum is σ = 1242498843992. Its totient is φ = 1242498843990.

The previous prime is 1242498843961. The next prime is 1242498844009. The reversal of 1242498843991 is 1993488942421.

It is a strong prime.

It is an emirp because it is prime and its reverse (1993488942421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1242498843991 - 2⁵ = 1242498843959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1242498843931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621249421995 + 621249421996.

It is an arithmetic number, because the mean of its divisors is an integer number (621249421996).

Almost surely, 2^{1242498843991} is an apocalyptic number.

1242498843991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242498843991 is an equidigital number, since it uses as much as digits as its factorization.

1242498843991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 35831808, while the sum is 64.

The spelling of 1242498843991 in words is "one trillion, two hundred forty-two billion, four hundred ninety-eight million, eight hundred forty-three thousand, nine hundred ninety-one".