11731742891 has 32 divisors (see below), whose sum is σ = 13725754560. Its totient is φ = 9909043200.

The previous prime is 11731742861. The next prime is 11731742909. The reversal of 11731742891 is 19824713711.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11731742891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11731742861) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11626595 + ... + 11627603.

It is an arithmetic number, because the mean of its divisors is an integer number (428929830).

Almost surely, 2^11731742891 is an apocalyptic number.

11731742891 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11731742891 is a deficient number, since it is larger than the sum of its proper divisors (1994011669).

11731742891 is a wasteful number, since it uses less digits than its factorization.

11731742891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1775.

The product of its digits is 84672, while the sum is 44.

The spelling of 11731742891 in words is "eleven billion, seven hundred thirty-one million, seven hundred forty-two thousand, eight hundred ninety-one".