1198125557 has 4 divisors (see below), whose sum is σ = 1216008096. Its totient is φ = 1180243020.

The previous prime is 1198125443. The next prime is 1198125563. The reversal of 1198125557 is 7555218911.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1198125557 - 2¹⁶ = 1198060021 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 (1198125587) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8941169 + ... + 8941302.

It is an arithmetic number, because the mean of its divisors is an integer number (304002024).

Almost surely, 2^1198125557 is an apocalyptic number.

It is an amenable number.

1198125557 is a deficient number, since it is larger than the sum of its proper divisors (17882539).

1198125557 is an equidigital number, since it uses as much as digits as its factorization.

1198125557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17882538.

The product of its digits is 126000, while the sum is 44.

The square root of 1198125557 is about 34613.9503235329. The cubic root of 1198125557 is about 1062.1049772511.

The spelling of 1198125557 in words is "one billion, one hundred ninety-eight million, one hundred twenty-five thousand, five hundred fifty-seven".