1001000000091 has 32 divisors (see below), whose sum is σ = 1643745922560. Its totient is φ = 527653096704.

The previous prime is 1001000000053. The next prime is 1001000000093. The reversal of 1001000000091 is 1900000001001.

It is not a de Polignac number, because 1001000000091 - 2⁹ = 1000999999579 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1001000000093) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 787986 + ... + 1619543.

It is an arithmetic number, because the mean of its divisors is an integer number (51367060080).

Almost surely, 2^{1001000000091} is an apocalyptic number.

1001000000091 is a deficient number, since it is larger than the sum of its proper divisors (642745922469).

1001000000091 is a wasteful number, since it uses less digits than its factorization.

1001000000091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2409075.

The product of its (nonzero) digits is 9, while the sum is 12.

Adding to 1001000000091 its reverse (1900000001001), we get a palindrome (2901000001092).

The spelling of 1001000000091 in words is "one trillion, one billion, ninety-one", and thus it is an aban number and an uban number.