1191492797 has 4 divisors (see below), whose sum is σ = 1299810336. Its totient is φ = 1083175260.

The previous prime is 1191492779. The next prime is 1191492803. The reversal of 1191492797 is 7972941911.

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 1191492797 - 2⁸ = 1191492541 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1191492707) 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, 54158753 + ... + 54158774.

It is an arithmetic number, because the mean of its divisors is an integer number (324952584).

Almost surely, 2^1191492797 is an apocalyptic number.

It is an amenable number.

1191492797 is a deficient number, since it is larger than the sum of its proper divisors (108317539).

1191492797 is a wasteful number, since it uses less digits than its factorization.

1191492797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108317538.

The product of its digits is 285768, while the sum is 50.

The square root of 1191492797 is about 34518.0068514971. The cubic root of 1191492797 is about 1060.1414303397.

The spelling of 1191492797 in words is "one billion, one hundred ninety-one million, four hundred ninety-two thousand, seven hundred ninety-seven".