91876289 has 4 divisors (see below), whose sum is σ = 93039360. Its totient is φ = 90713220.

The previous prime is 91876277. The next prime is 91876339. The reversal of 91876289 is 98267819.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91876289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91876249) 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, 581417 + ... + 581574.

It is an arithmetic number, because the mean of its divisors is an integer number (23259840).

Almost surely, 2^91876289 is an apocalyptic number.

It is an amenable number.

91876289 is a deficient number, since it is larger than the sum of its proper divisors (1163071).

91876289 is a wasteful number, since it uses less digits than its factorization.

91876289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1163070.

The product of its digits is 435456, while the sum is 50.

The square root of 91876289 is about 9585.2119955690. The cubic root of 91876289 is about 451.2333065240.

The spelling of 91876289 in words is "ninety-one million, eight hundred seventy-six thousand, two hundred eighty-nine".