91241788 has 48 divisors (see below), whose sum is σ = 185601024. Its totient is φ = 38787840.

The previous prime is 91241783. The next prime is 91241797. The reversal of 91241788 is 88714219.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 91241788.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91241783) 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, 166531 + ... + 167077.

It is an arithmetic number, because the mean of its divisors is an integer number (3866688).

Almost surely, 2^91241788 is an apocalyptic number.

It is an amenable number.

91241788 is an abundant number, since it is smaller than the sum of its proper divisors (94359236).

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

91241788 is a wasteful number, since it uses less digits than its factorization.

91241788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 802 (or 800 counting only the distinct ones).

The product of its digits is 32256, while the sum is 40.

The square root of 91241788 is about 9552.0567418750. The cubic root of 91241788 is about 450.1921615518.

It can be divided in two parts, 91241 and 788, that added together give a palindrome (92029).

The spelling of 91241788 in words is "ninety-one million, two hundred forty-one thousand, seven hundred eighty-eight".