1198549813 has 4 divisors (see below), whose sum is σ = 1198692000. Its totient is φ = 1198407628.

The previous prime is 1198549799. The next prime is 1198549829. The reversal of 1198549813 is 3189458911.

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 1198549813 - 2¹³ = 1198541621 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 (1198549853) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57595 + ... + 75592.

It is an arithmetic number, because the mean of its divisors is an integer number (299673000).

Almost surely, 2^1198549813 is an apocalyptic number.

It is an amenable number.

1198549813 is a deficient number, since it is larger than the sum of its proper divisors (142187).

1198549813 is an equidigital number, since it uses as much as digits as its factorization.

1198549813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142186.

The product of its digits is 311040, while the sum is 49.

The square root of 1198549813 is about 34620.0781772659. The cubic root of 1198549813 is about 1062.2303261710.

The spelling of 1198549813 in words is "one billion, one hundred ninety-eight million, five hundred forty-nine thousand, eight hundred thirteen".