91644143 has 8 divisors (see below), whose sum is σ = 95420976. Its totient is φ = 87940800.

The previous prime is 91644131. The next prime is 91644149. The reversal of 91644143 is 34144619.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 91644143 - 2¹⁰ = 91643119 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91644149) 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, 15821 + ... + 20822.

It is an arithmetic number, because the mean of its divisors is an integer number (11927622).

Almost surely, 2^91644143 is an apocalyptic number.

91644143 is a deficient number, since it is larger than the sum of its proper divisors (3776833).

91644143 is a wasteful number, since it uses less digits than its factorization.

91644143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36745.

The product of its digits is 10368, while the sum is 32.

The square root of 91644143 is about 9573.0947451699. The cubic root of 91644143 is about 450.8529386807.

The spelling of 91644143 in words is "ninety-one million, six hundred forty-four thousand, one hundred forty-three".