1005500091 has 8 divisors (see below), whose sum is σ = 1349545984. Its totient is φ = 665893800.

The previous prime is 1005500077. The next prime is 1005500107. The reversal of 1005500091 is 1900055001.

It is a happy number.

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

It is not a de Polignac number, because 1005500091 - 2⁵ = 1005500059 is a prime.

It is a super-2 number, since 2×1005500091² = 2022060866002016562, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1005500291) 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, 1109371 + ... + 1110276.

It is an arithmetic number, because the mean of its divisors is an integer number (168693248).

Almost surely, 2^1005500091 is an apocalyptic number.

1005500091 is a deficient number, since it is larger than the sum of its proper divisors (344045893).

1005500091 is a wasteful number, since it uses less digits than its factorization.

1005500091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2219801.

The product of its (nonzero) digits is 225, while the sum is 21.

The square root of 1005500091 is about 31709.6214263116. The cubic root of 1005500091 is about 1001.8300126774.

Adding to 1005500091 its reverse (1900055001), we get a palindrome (2905555092).

The spelling of 1005500091 in words is "one billion, five million, five hundred thousand, ninety-one".