91078291 has 4 divisors (see below), whose sum is σ = 91353784. Its totient is φ = 90802800.

The previous prime is 91078283. The next prime is 91078297. The reversal of 91078291 is 19287019.

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 91078291 - 2³ = 91078283 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 91078291.

It is not an unprimeable number, because it can be changed into a prime (91078297) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 137250 + ... + 137911.

It is an arithmetic number, because the mean of its divisors is an integer number (22838446).

Almost surely, 2^91078291 is an apocalyptic number.

91078291 is a deficient number, since it is larger than the sum of its proper divisors (275493).

91078291 is a wasteful number, since it uses less digits than its factorization.

91078291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275492.

The product of its (nonzero) digits is 9072, while the sum is 37.

The square root of 91078291 is about 9543.4946953409. The cubic root of 91078291 is about 449.9230996165.

The spelling of 91078291 in words is "ninety-one million, seventy-eight thousand, two hundred ninety-one".