991100050 has 24 divisors (see below), whose sum is σ = 1844916516. Its totient is φ = 396123840.

The previous prime is 991099973. The next prime is 991100081. The reversal of 991100050 is 50001199.

It can be written as a sum of positive squares in 6 ways, for example, as 685444761 + 305655289 = 26181^2 + 17483^2 .

It is a super-2 number, since 2×991100050² = 1964558618220005000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a junction number, because it is equal to n+sod(n) for n = 991099988 and 991100024.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 61432 + ... + 75868.

Almost surely, 2^991100050 is an apocalyptic number.

991100050 is a deficient number, since it is larger than the sum of its proper divisors (853816466).

991100050 is a wasteful number, since it uses less digits than its factorization.

991100050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15822 (or 15817 counting only the distinct ones).

The product of its (nonzero) digits is 405, while the sum is 25.

The square root of 991100050 is about 31481.7415337843. The cubic root of 991100050 is about 997.0245052120.

The spelling of 991100050 in words is "nine hundred ninety-one million, one hundred thousand, fifty".