1242265579 has 2 divisors, whose sum is σ = 1242265580. Its totient is φ = 1242265578.

The previous prime is 1242265567. The next prime is 1242265603. The reversal of 1242265579 is 9755622421.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1242265579 - 2¹⁵ = 1242232811 is a prime.

It is not a weakly prime, because it can be changed into another prime (1242265679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621132789 + 621132790.

It is an arithmetic number, because the mean of its divisors is an integer number (621132790).

Almost surely, 2^1242265579 is an apocalyptic number.

1242265579 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242265579 is an equidigital number, since it uses as much as digits as its factorization.

1242265579 is an evil number, because the sum of its binary digits is even.

The product of its digits is 302400, while the sum is 43.

The square root of 1242265579 is about 35245.7881029776. The cubic root of 1242265579 is about 1074.9909727744.

The spelling of 1242265579 in words is "one billion, two hundred forty-two million, two hundred sixty-five thousand, five hundred seventy-nine".