1191315771 has 12 divisors (see below), whose sum is σ = 1776299200. Its totient is φ = 768590640.

The previous prime is 1191315761. The next prime is 1191315781. The reversal of 1191315771 is 1775131911.

It is an interprime number because it is at equal distance from previous prime (1191315761) and next prime (1191315781).

It is not a de Polignac number, because 1191315771 - 2⁶ = 1191315707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1191315761) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2134696 + ... + 2135253.

Almost surely, 2^1191315771 is an apocalyptic number.

1191315771 is a deficient number, since it is larger than the sum of its proper divisors (584983429).

1191315771 is a wasteful number, since it uses less digits than its factorization.

1191315771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4269986 (or 4269983 counting only the distinct ones).

The product of its digits is 6615, while the sum is 36.

The square root of 1191315771 is about 34515.4425004229. The cubic root of 1191315771 is about 1060.0889242475.

The spelling of 1191315771 in words is "one billion, one hundred ninety-one million, three hundred fifteen thousand, seven hundred seventy-one".