91010101001 has 32 divisors (see below), whose sum is σ = 100958731776. Its totient is φ = 81679104000.

The previous prime is 91010100991. The next prime is 91010101031. The reversal of 91010101001 is 10010101019.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 91010101001 - 2²⁶ = 90942992137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91010101031) 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, 10006466 + ... + 10015556.

It is an arithmetic number, because the mean of its divisors is an integer number (3154960368).

Almost surely, 2^91010101001 is an apocalyptic number.

It is an amenable number.

91010101001 is a deficient number, since it is larger than the sum of its proper divisors (9948630775).

91010101001 is a wasteful number, since it uses less digits than its factorization.

91010101001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9473.

The product of its (nonzero) digits is 9, while the sum is 14.

The spelling of 91010101001 in words is "ninety-one billion, ten million, one hundred one thousand, one".