1191142749 has 8 divisors (see below), whose sum is σ = 1588350400. Its totient is φ = 794015136.

The previous prime is 1191142747. The next prime is 1191142759. The reversal of 1191142749 is 9472411911.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1191142749 - 2¹ = 1191142747 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 (1191142747) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43689 + ... + 65505.

It is an arithmetic number, because the mean of its divisors is an integer number (198543800).

Almost surely, 2^1191142749 is an apocalyptic number.

It is an amenable number.

1191142749 is a deficient number, since it is larger than the sum of its proper divisors (397207651).

1191142749 is a wasteful number, since it uses less digits than its factorization.

1191142749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40019.

The product of its digits is 18144, while the sum is 39.

The square root of 1191142749 is about 34512.9359660983. The cubic root of 1191142749 is about 1060.0376007191.

The spelling of 1191142749 in words is "one billion, one hundred ninety-one million, one hundred forty-two thousand, seven hundred forty-nine".