91804425 has 12 divisors (see below), whose sum is σ = 151783440. Its totient is φ = 48962320.

The previous prime is 91804421. The next prime is 91804429. The reversal of 91804425 is 52440819.

It is an interprime number because it is at equal distance from previous prime (91804421) and next prime (91804429).

It is not a de Polignac number, because 91804425 - 2² = 91804421 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (91804421) 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 11 ways as a sum of consecutive naturals, for example, 611955 + ... + 612104.

It is an arithmetic number, because the mean of its divisors is an integer number (12648620).

Almost surely, 2^91804425 is an apocalyptic number.

It is an amenable number.

91804425 is a deficient number, since it is larger than the sum of its proper divisors (59979015).

91804425 is a wasteful number, since it uses less digits than its factorization.

91804425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1224072 (or 1224067 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 91804425 is about 9581.4625710275. The cubic root of 91804425 is about 451.1156269461.

It can be divided in two parts, 91804 and 425, that added together give a palindrome (92229).

The spelling of 91804425 in words is "ninety-one million, eight hundred four thousand, four hundred twenty-five".