1242331787 has 2 divisors, whose sum is σ = 1242331788. Its totient is φ = 1242331786.

The previous prime is 1242331771. The next prime is 1242331859. The reversal of 1242331787 is 7871332421.

It is a weak prime.

It is an emirp because it is prime and its reverse (7871332421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1242331787 - 2⁴ = 1242331771 is a prime.

It is a super-2 number, since 2×1242331787² = 3086776537981226738, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1242331787.

It is not a weakly prime, because it can be changed into another prime (1242331747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621165893 + 621165894.

It is an arithmetic number, because the mean of its divisors is an integer number (621165894).

Almost surely, 2^1242331787 is an apocalyptic number.

1242331787 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242331787 is an equidigital number, since it uses as much as digits as its factorization.

1242331787 is an evil number, because the sum of its binary digits is even.

The product of its digits is 56448, while the sum is 38.

The square root of 1242331787 is about 35246.7273232566. The cubic root of 1242331787 is about 1075.0100700697.

The spelling of 1242331787 in words is "one billion, two hundred forty-two million, three hundred thirty-one thousand, seven hundred eighty-seven".