91801149 has 8 divisors (see below), whose sum is σ = 133528992. Its totient is φ = 55637040.

The previous prime is 91801147. The next prime is 91801163. The reversal of 91801149 is 94110819.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 91801149 - 2¹ = 91801147 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 2781853 = 91801149 / (9 + 1 + 8 + 0 + 1 + 1 + 4 + 9).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91801147) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1390894 + ... + 1390959.

It is an arithmetic number, because the mean of its divisors is an integer number (16691124).

Almost surely, 2^91801149 is an apocalyptic number.

It is an amenable number.

91801149 is a deficient number, since it is larger than the sum of its proper divisors (41727843).

91801149 is a wasteful number, since it uses less digits than its factorization.

91801149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2781867.

The product of its (nonzero) digits is 2592, while the sum is 33.

The square root of 91801149 is about 9581.2916143910. The cubic root of 91801149 is about 451.1102609289.

The spelling of 91801149 in words is "ninety-one million, eight hundred one thousand, one hundred forty-nine".