1198556087 has 2 divisors, whose sum is σ = 1198556088. Its totient is φ = 1198556086.

The previous prime is 1198556039. The next prime is 1198556143. The reversal of 1198556087 is 7806558911.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1198556087 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1198558087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 599278043 + 599278044.

It is an arithmetic number, because the mean of its divisors is an integer number (599278044).

Almost surely, 2^1198556087 is an apocalyptic number.

1198556087 is a deficient number, since it is larger than the sum of its proper divisors (1).

1198556087 is an equidigital number, since it uses as much as digits as its factorization.

1198556087 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 604800, while the sum is 50.

The square root of 1198556087 is about 34620.1687893055. The cubic root of 1198556087 is about 1062.2321796391.

The spelling of 1198556087 in words is "one billion, one hundred ninety-eight million, five hundred fifty-six thousand, eighty-seven".