91440851 has 4 divisors (see below), whose sum is σ = 92542632. Its totient is φ = 90339072.

The previous prime is 91440827. The next prime is 91440883. The reversal of 91440851 is 15804419.

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

It is a cyclic number.

It is not a de Polignac number, because 91440851 - 2¹⁰ = 91439827 is a prime.

It is a super-2 number, since 2×91440851² = 16722858463208402, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91440551) 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, 550766 + ... + 550931.

It is an arithmetic number, because the mean of its divisors is an integer number (23135658).

Almost surely, 2^91440851 is an apocalyptic number.

91440851 is a deficient number, since it is larger than the sum of its proper divisors (1101781).

91440851 is a wasteful number, since it uses less digits than its factorization.

91440851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1101780.

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

The square root of 91440851 is about 9562.4709672762. The cubic root of 91440851 is about 450.5193197931.

The spelling of 91440851 in words is "ninety-one million, four hundred forty thousand, eight hundred fifty-one".