91010010001 has 4 divisors (see below), whose sum is σ = 91247634432. Its totient is φ = 90772385572.

The previous prime is 91010009971. The next prime is 91010010079. The reversal of 91010010001 is 10001001019.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 91010010001 - 2⁵ = 91010009969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91010017001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 118811641 + ... + 118812406.

It is an arithmetic number, because the mean of its divisors is an integer number (22811908608).

Almost surely, 2^91010010001 is an apocalyptic number.

It is an amenable number.

91010010001 is a deficient number, since it is larger than the sum of its proper divisors (237624431).

91010010001 is a wasteful number, since it uses less digits than its factorization.

91010010001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237624430.

The product of its (nonzero) digits is 9, while the sum is 13.

The spelling of 91010010001 in words is "ninety-one billion, ten million, ten thousand, one".