91000202001 has 8 divisors (see below), whose sum is σ = 121693644384. Its totient is φ = 60486780480.

The previous prime is 91000201967. The next prime is 91000202047. The reversal of 91000202001 is 10020200019.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 91000202001 - 2⁹ = 91000201489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91000202101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45004035 + ... + 45006056.

It is an arithmetic number, because the mean of its divisors is an integer number (15211705548).

Almost surely, 2^91000202001 is an apocalyptic number.

It is an amenable number.

91000202001 is a deficient number, since it is larger than the sum of its proper divisors (30693442383).

91000202001 is a wasteful number, since it uses less digits than its factorization.

91000202001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90010431.

The product of its (nonzero) digits is 36, while the sum is 15.

The spelling of 91000202001 in words is "ninety-one billion, two hundred two thousand, one".