91101820019 has 16 divisors (see below), whose sum is σ = 105707525376. Its totient is φ = 76894725600.

The previous prime is 91101819959. The next prime is 91101820063. The reversal of 91101820019 is 91002810119.

It is not a de Polignac number, because 91101820019 - 2¹⁶ = 91101754483 is a prime.

It is a super-2 number, since 2×91101820019² (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 (91101820919) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1360709 + ... + 1426089.

It is an arithmetic number, because the mean of its divisors is an integer number (6606720336).

Almost surely, 2^91101820019 is an apocalyptic number.

91101820019 is a deficient number, since it is larger than the sum of its proper divisors (14605705357).

91101820019 is a wasteful number, since it uses less digits than its factorization.

91101820019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68426.

The product of its (nonzero) digits is 1296, while the sum is 32.

The spelling of 91101820019 in words is "ninety-one billion, one hundred one million, eight hundred twenty thousand, nineteen".