91805142 has 64 divisors (see below), whose sum is σ = 219066624. Its totient is φ = 25280640.

The previous prime is 91805123. The next prime is 91805143. The reversal of 91805142 is 24150819.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91805143) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 56688 + ... + 58284.

It is an arithmetic number, because the mean of its divisors is an integer number (3422916).

Almost surely, 2^91805142 is an apocalyptic number.

It is a pronic number, being equal to 9581×9582.

It is a practical number, because each smaller number is the sum of distinct divisors of 91805142, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (109533312).

91805142 is an abundant number, since it is smaller than the sum of its proper divisors (127261482).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91805142 is a wasteful number, since it uses less digits than its factorization.

91805142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1693.

The product of its (nonzero) digits is 2880, while the sum is 30.

The square root of 91805142 is about 9581.4999869540. The cubic root of 91805142 is about 451.1168013596.

The spelling of 91805142 in words is "ninety-one million, eight hundred five thousand, one hundred forty-two".