1170900991 has 4 divisors (see below), whose sum is σ = 1260970312. Its totient is φ = 1080831672.

The previous prime is 1170900967. The next prime is 1170901021. The reversal of 1170900991 is 1990090711.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1170900991 - 2²³ = 1162512383 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 1170900991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1170900091) 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 3 ways as a sum of consecutive naturals, for example, 45034641 + ... + 45034666.

It is an arithmetic number, because the mean of its divisors is an integer number (315242578).

Almost surely, 2^1170900991 is an apocalyptic number.

1170900991 is a deficient number, since it is larger than the sum of its proper divisors (90069321).

1170900991 is an equidigital number, since it uses as much as digits as its factorization.

1170900991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90069320.

The product of its (nonzero) digits is 5103, while the sum is 37.

The square root of 1170900991 is about 34218.4305747648. The cubic root of 1170900991 is about 1053.9986578626.

The spelling of 1170900991 in words is "one billion, one hundred seventy million, nine hundred thousand, nine hundred ninety-one".