1191157749 has 12 divisors (see below), whose sum is σ = 1760574816. Its totient is φ = 775637352.

The previous prime is 1191157729. The next prime is 1191157763. The reversal of 1191157749 is 9477511911.

It is not a de Polignac number, because 1191157749 - 2⁷ = 1191157621 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1191157729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1538577 + ... + 1539350.

It is an arithmetic number, because the mean of its divisors is an integer number (146714568).

Almost surely, 2^1191157749 is an apocalyptic number.

It is an amenable number.

1191157749 is a deficient number, since it is larger than the sum of its proper divisors (569417067).

1191157749 is a wasteful number, since it uses less digits than its factorization.

1191157749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3077976 (or 3077973 counting only the distinct ones).

The product of its digits is 79380, while the sum is 45.

The square root of 1191157749 is about 34513.1532752370. The cubic root of 1191157749 is about 1060.0420503670.

The spelling of 1191157749 in words is "one billion, one hundred ninety-one million, one hundred fifty-seven thousand, seven hundred forty-nine".