91820091001 has 8 divisors (see below), whose sum is σ = 93048076800. Its totient is φ = 90599393472.

The previous prime is 91820090939. The next prime is 91820091017. The reversal of 91820091001 is 10019002819.

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

It is not a de Polignac number, because 91820091001 - 2⁹ = 91820090489 is a prime.

It is a super-2 number, since 2×91820091001² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91820001001) 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, 1796701 + ... + 1847098.

It is an arithmetic number, because the mean of its divisors is an integer number (11631009600).

Almost surely, 2^91820091001 is an apocalyptic number.

It is an amenable number.

91820091001 is a deficient number, since it is larger than the sum of its proper divisors (1227985799).

91820091001 is a wasteful number, since it uses less digits than its factorization.

91820091001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3644135.

The product of its (nonzero) digits is 1296, while the sum is 31.

The spelling of 91820091001 in words is "ninety-one billion, eight hundred twenty million, ninety-one thousand, one".