1191792989 has 4 divisors (see below), whose sum is σ = 1191925056. Its totient is φ = 1191660924.

The previous prime is 1191792983. The next prime is 1191793061. The reversal of 1191792989 is 9892971911.

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 1191792989 - 2²⁴ = 1175015773 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 (1191792983) 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, 51419 + ... + 70904.

It is an arithmetic number, because the mean of its divisors is an integer number (297981264).

Almost surely, 2^1191792989 is an apocalyptic number.

It is an amenable number.

1191792989 is a deficient number, since it is larger than the sum of its proper divisors (132067).

1191792989 is an equidigital number, since it uses as much as digits as its factorization.

1191792989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132066.

The product of its digits is 734832, while the sum is 56.

The square root of 1191792989 is about 34522.3549167782. The cubic root of 1191792989 is about 1060.2304557074.

The spelling of 1191792989 in words is "one billion, one hundred ninety-one million, seven hundred ninety-two thousand, nine hundred eighty-nine".