1172570991 has 8 divisors (see below), whose sum is σ = 1572465840. Its totient is φ = 777195072.

The previous prime is 1172570977. The next prime is 1172571011. The reversal of 1172570991 is 1990752711.

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

It is not a de Polignac number, because 1172570991 - 2¹⁵ = 1172538223 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1172570951) 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, 1129126 + ... + 1130163.

It is an arithmetic number, because the mean of its divisors is an integer number (196558230).

Almost surely, 2^1172570991 is an apocalyptic number.

1172570991 is a deficient number, since it is larger than the sum of its proper divisors (399894849).

1172570991 is a wasteful number, since it uses less digits than its factorization.

1172570991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2259465.

The product of its (nonzero) digits is 39690, while the sum is 42.

The square root of 1172570991 is about 34242.8239343662. The cubic root of 1172570991 is about 1054.4995090919.

The spelling of 1172570991 in words is "one billion, one hundred seventy-two million, five hundred seventy thousand, nine hundred ninety-one".