91078855 has 16 divisors (see below), whose sum is σ = 125317440. Its totient is φ = 62249472.

The previous prime is 91078853. The next prime is 91078861. The reversal of 91078855 is 55887019.

It is a cyclic number.

It is not a de Polignac number, because 91078855 - 2¹ = 91078853 is a prime.

It is a super-2 number, since 2×91078855² = 16590715656222050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91078853) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6991 + ... + 15199.

It is an arithmetic number, because the mean of its divisors is an integer number (7832340).

Almost surely, 2^91078855 is an apocalyptic number.

91078855 is a deficient number, since it is larger than the sum of its proper divisors (34238585).

91078855 is a wasteful number, since it uses less digits than its factorization.

91078855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8538.

The product of its (nonzero) digits is 100800, while the sum is 43.

The square root of 91078855 is about 9543.5242442192. The cubic root of 91078855 is about 449.9240283270.

The spelling of 91078855 in words is "ninety-one million, seventy-eight thousand, eight hundred fifty-five".