991100727 has 6 divisors (see below), whose sum is σ = 1431589952. Its totient is φ = 660733812.

The previous prime is 991100717. The next prime is 991100729. The reversal of 991100727 is 727001199.

It is not a de Polignac number, because 991100727 - 2¹⁶ = 991035191 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 991100691 and 991100700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991100729) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 55061143 + ... + 55061160.

Almost surely, 2^991100727 is an apocalyptic number.

991100727 is a deficient number, since it is larger than the sum of its proper divisors (440489225).

991100727 is a wasteful number, since it uses less digits than its factorization.

991100727 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110122309 (or 110122306 counting only the distinct ones).

The product of its (nonzero) digits is 7938, while the sum is 36.

The square root of 991100727 is about 31481.7522860466. The cubic root of 991100727 is about 997.0247322276.

The spelling of 991100727 in words is "nine hundred ninety-one million, one hundred thousand, seven hundred twenty-seven".