1000550091 has 4 divisors (see below), whose sum is σ = 1334066792. Its totient is φ = 667033392.

The previous prime is 1000550039. The next prime is 1000550093. The reversal of 1000550091 is 1900550001.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1000550091 - 2⁶ = 1000550027 is a prime.

It is a super-2 number, since 2×1000550091² = 2002200969200216562, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1000550093) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 166758346 + ... + 166758351.

It is an arithmetic number, because the mean of its divisors is an integer number (333516698).

Almost surely, 2^1000550091 is an apocalyptic number.

1000550091 is a deficient number, since it is larger than the sum of its proper divisors (333516701).

1000550091 is an equidigital number, since it uses as much as digits as its factorization.

1000550091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333516700.

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

The square root of 1000550091 is about 31631.4731082825. The cubic root of 1000550091 is about 1000.1833300547.

The spelling of 1000550091 in words is "one billion, five hundred fifty thousand, ninety-one".