1242755199 has 90 divisors (see below), whose sum is σ = 2235758200. Its totient is φ = 665013888.

The previous prime is 1242755197. The next prime is 1242755203. The reversal of 1242755199 is 9915572421.

1242755199 is a `hidden beast` number, since 1 + 2 + 4 + 2 + 7 + 551 + 99 = 666.

It is not a de Polignac number, because 1242755199 - 2¹ = 1242755197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242755191) by changing a digit.

It is a polite number, since it can be written in 89 ways as a sum of consecutive naturals, for example, 6244902 + ... + 6245100.

Almost surely, 2^1242755199 is an apocalyptic number.

1242755199 is a deficient number, since it is larger than the sum of its proper divisors (993003001).

1242755199 is an equidigital number, since it uses as much as digits as its factorization.

1242755199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267 (or 226 counting only the distinct ones).

The product of its digits is 226800, while the sum is 45.

The square root of 1242755199 is about 35252.7332131850. The cubic root of 1242755199 is about 1075.1321846470.

The spelling of 1242755199 in words is "one billion, two hundred forty-two million, seven hundred fifty-five thousand, one hundred ninety-nine".