1198366561 has 4 divisors (see below), whose sum is σ = 1369561792. Its totient is φ = 1027171332.

The previous prime is 1198366553. The next prime is 1198366571. The reversal of 1198366561 is 1656638911.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1656638911 = 2819 ⋅587669.

It is a cyclic number.

It is not a de Polignac number, because 1198366561 - 2³ = 1198366553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1198366531) 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, 85597605 + ... + 85597618.

It is an arithmetic number, because the mean of its divisors is an integer number (342390448).

Almost surely, 2^1198366561 is an apocalyptic number.

It is an amenable number.

1198366561 is a deficient number, since it is larger than the sum of its proper divisors (171195231).

1198366561 is an equidigital number, since it uses as much as digits as its factorization.

1198366561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171195230.

The product of its digits is 233280, while the sum is 46.

The square root of 1198366561 is about 34617.4314616206. The cubic root of 1198366561 is about 1062.1761869240.

The spelling of 1198366561 in words is "one billion, one hundred ninety-eight million, three hundred sixty-six thousand, five hundred sixty-one".