91879143 has 4 divisors (see below), whose sum is σ = 122505528. Its totient is φ = 61252760.

The previous prime is 91879141. The next prime is 91879147. The reversal of 91879143 is 34197819.

It is a happy number.

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 91879143 - 2¹ = 91879141 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 91879095 and 91879104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91879141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15313188 + ... + 15313193.

It is an arithmetic number, because the mean of its divisors is an integer number (30626382).

Almost surely, 2^91879143 is an apocalyptic number.

91879143 is a deficient number, since it is larger than the sum of its proper divisors (30626385).

91879143 is a wasteful number, since it uses less digits than its factorization.

91879143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30626384.

The product of its digits is 54432, while the sum is 42.

The square root of 91879143 is about 9585.3608695761. The cubic root of 91879143 is about 451.2379787724.

The spelling of 91879143 in words is "ninety-one million, eight hundred seventy-nine thousand, one hundred forty-three".