91841906 has 8 divisors (see below), whose sum is σ = 148360044. Its totient is φ = 42388560.

The previous prime is 91841903. The next prime is 91841947. The reversal of 91841906 is 60914819.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 88266025 + 3575881 = 9395^2 + 1891^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 91841906.

It is not an unprimeable number, because it can be changed into a prime (91841903) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1766165 + ... + 1766216.

Almost surely, 2^91841906 is an apocalyptic number.

91841906 is a deficient number, since it is larger than the sum of its proper divisors (56518138).

91841906 is a wasteful number, since it uses less digits than its factorization.

91841906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3532396.

The product of its (nonzero) digits is 15552, while the sum is 38.

The square root of 91841906 is about 9583.4182836815. The cubic root of 91841906 is about 451.1770109309.

It can be divided in two parts, 918 and 41906, that added together give a palindrome (42824).

The spelling of 91841906 in words is "ninety-one million, eight hundred forty-one thousand, nine hundred six".