1191767871 has 8 divisors (see below), whose sum is σ = 1816027264. Its totient is φ = 681010200.

The previous prime is 1191767849. The next prime is 1191767897. The reversal of 1191767871 is 1787671911.

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

It is not a de Polignac number, because 1191767871 - 2⁹ = 1191767359 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1191767871.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1191767821) 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, 28375405 + ... + 28375446.

It is an arithmetic number, because the mean of its divisors is an integer number (227003408).

Almost surely, 2^1191767871 is an apocalyptic number.

1191767871 is a deficient number, since it is larger than the sum of its proper divisors (624259393).

1191767871 is an equidigital number, since it uses as much as digits as its factorization.

1191767871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56750861.

The product of its digits is 148176, while the sum is 48.

The square root of 1191767871 is about 34521.9911216025. The cubic root of 1191767871 is about 1060.2230072506.

The spelling of 1191767871 in words is "one billion, one hundred ninety-one million, seven hundred sixty-seven thousand, eight hundred seventy-one".