91404851 has 4 divisors (see below), whose sum is σ = 91425000. Its totient is φ = 91384704.

The previous prime is 91404827. The next prime is 91404917. The reversal of 91404851 is 15840419.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91404851 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91404251) 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, 275 + ... + 13523.

It is an arithmetic number, because the mean of its divisors is an integer number (22856250).

Almost surely, 2^91404851 is an apocalyptic number.

91404851 is a deficient number, since it is larger than the sum of its proper divisors (20149).

91404851 is a wasteful number, since it uses less digits than its factorization.

91404851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20148.

The product of its (nonzero) digits is 5760, while the sum is 32.

The square root of 91404851 is about 9560.5884233137. The cubic root of 91404851 is about 450.4601893125.

The spelling of 91404851 in words is "ninety-one million, four hundred four thousand, eight hundred fifty-one".