1000000091 has 8 divisors (see below), whose sum is σ = 1022692800. Its totient is φ = 977558400.

The previous prime is 1000000087. The next prime is 1000000093. The reversal of 1000000091 is 1900000001.

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 1000000091 - 2² = 1000000087 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1000000093) 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, 54686 + ... + 70643.

It is an arithmetic number, because the mean of its divisors is an integer number (127836600).

Almost surely, 2^1000000091 is an apocalyptic number.

1000000091 is a deficient number, since it is larger than the sum of its proper divisors (22692709).

1000000091 is a wasteful number, since it uses less digits than its factorization.

1000000091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125509.

The product of its (nonzero) digits is 9, while the sum is 11.

The square root of 1000000091 is about 31622.7780405201. The cubic root of 1000000091 is about 1000.0000303333. Note that the first 4 decimals are identical.

Adding to 1000000091 its reverse (1900000001), we get a palindrome (2900000092).

The spelling of 1000000091 in words is "one billion, ninety-one", and thus it is an aban number and an uban number.