991190807 has 8 divisors (see below), whose sum is σ = 1046960640. Its totient is φ = 936908280.

The previous prime is 991190747. The next prime is 991190813. The reversal of 991190807 is 708091199.

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 991190807 - 2¹⁴ = 991174423 is a prime.

It is a super-2 number, since 2×991190807² = 1964918431762622498, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991190887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 370457 + ... + 373122.

It is an arithmetic number, because the mean of its divisors is an integer number (130870080).

Almost surely, 2^991190807 is an apocalyptic number.

991190807 is a deficient number, since it is larger than the sum of its proper divisors (55769833).

991190807 is a wasteful number, since it uses less digits than its factorization.

991190807 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 743653.

The product of its (nonzero) digits is 40824, while the sum is 44.

The square root of 991190807 is about 31483.1829235864. The cubic root of 991190807 is about 997.0549374545.

The spelling of 991190807 in words is "nine hundred ninety-one million, one hundred ninety thousand, eight hundred seven".