1167720091 has 8 divisors (see below), whose sum is σ = 1173012480. Its totient is φ = 1162440552.

The previous prime is 1167720077. The next prime is 1167720109. The reversal of 1167720091 is 1900277611.

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

It is a cyclic number.

It is not a de Polignac number, because 1167720091 - 2²³ = 1159331483 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1167720041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 209446 + ... + 214948.

It is an arithmetic number, because the mean of its divisors is an integer number (146626560).

Almost surely, 2^1167720091 is an apocalyptic number.

1167720091 is a deficient number, since it is larger than the sum of its proper divisors (5292389).

1167720091 is an equidigital number, since it uses as much as digits as its factorization.

1167720091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6425.

The product of its (nonzero) digits is 5292, while the sum is 34.

The square root of 1167720091 is about 34171.9196270856. The cubic root of 1167720091 is about 1053.0433522404.

The spelling of 1167720091 in words is "one billion, one hundred sixty-seven million, seven hundred twenty thousand, ninety-one".