1242513997 has 2 divisors, whose sum is σ = 1242513998. Its totient is φ = 1242513996.

The previous prime is 1242513977. The next prime is 1242514051. The reversal of 1242513997 is 7993152421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1090386441 + 152127556 = 33021^2 + 12334^2 .

It is an emirp because it is prime and its reverse (7993152421) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1242513997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1242513977) 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, 621256998 + 621256999.

It is an arithmetic number, because the mean of its divisors is an integer number (621256999).

Almost surely, 2^1242513997 is an apocalyptic number.

It is an amenable number.

1242513997 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242513997 is an equidigital number, since it uses as much as digits as its factorization.

1242513997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 136080, while the sum is 43.

The square root of 1242513997 is about 35249.3120074704. The cubic root of 1242513997 is about 1075.0626239343.

The spelling of 1242513997 in words is "one billion, two hundred forty-two million, five hundred thirteen thousand, nine hundred ninety-seven".