1198783961 has 4 divisors (see below), whose sum is σ = 1199994624. Its totient is φ = 1197573300.

The previous prime is 1198783921. The next prime is 1198783969. The reversal of 1198783961 is 1693878911.

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 a de Polignac number, because none of the positive numbers 2^k-1198783961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1198783969) 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, 603845 + ... + 605826.

It is an arithmetic number, because the mean of its divisors is an integer number (299998656).

Almost surely, 2^1198783961 is an apocalyptic number.

It is an amenable number.

1198783961 is a deficient number, since it is larger than the sum of its proper divisors (1210663).

1198783961 is an equidigital number, since it uses as much as digits as its factorization.

1198783961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1210662.

The product of its digits is 653184, while the sum is 53.

The square root of 1198783961 is about 34623.4596913711. The cubic root of 1198783961 is about 1062.2994939016.

The spelling of 1198783961 in words is "one billion, one hundred ninety-eight million, seven hundred eighty-three thousand, nine hundred sixty-one".