91901040 has 160 divisors (see below), whose sum is σ = 355262976. Its totient is φ = 19092480.

The previous prime is 91901039. The next prime is 91901041. The reversal of 91901040 is 4010919.

It is an interprime number because it is at equal distance from previous prime (91901039) and next prime (91901041).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 91901040.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91901041) 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 31 ways as a sum of consecutive naturals, for example, 15994 + ... + 20966.

Almost surely, 2^91901040 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91901040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (177631488).

91901040 is an abundant number, since it is smaller than the sum of its proper divisors (263361936).

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

91901040 is a wasteful number, since it uses less digits than its factorization.

91901040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5007 (or 5001 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 24.

The square root of 91901040 is about 9586.5030120477. The cubic root of 91901040 is about 451.2738228638.

Adding to 91901040 its reverse (4010919), we get a palindrome (95911959).

The spelling of 91901040 in words is "ninety-one million, nine hundred one thousand, forty".