91994045 has 16 divisors (see below), whose sum is σ = 129693312. Its totient is φ = 61757760.

The previous prime is 91994033. The next prime is 91994047. The reversal of 91994045 is 54049919.

It is a happy number.

It is not a de Polignac number, because 91994045 - 2¹⁰ = 91993021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 91993993 and 91994011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91994047) 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, 63617 + ... + 65046.

It is an arithmetic number, because the mean of its divisors is an integer number (8105832).

Almost surely, 2^91994045 is an apocalyptic number.

It is an amenable number.

91994045 is a deficient number, since it is larger than the sum of its proper divisors (37699267).

91994045 is a wasteful number, since it uses less digits than its factorization.

91994045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128692.

The product of its (nonzero) digits is 58320, while the sum is 41.

The square root of 91994045 is about 9591.3526157680. The cubic root of 91994045 is about 451.4260031204.

The spelling of 91994045 in words is "ninety-one million, nine hundred ninety-four thousand, forty-five".