91399027 has 4 divisors (see below), whose sum is σ = 91904176. Its totient is φ = 90893880.

The previous prime is 91399013. The next prime is 91399031. The reversal of 91399027 is 72099319.

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 91399027 - 2¹¹ = 91396979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91399057) 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, 252303 + ... + 252664.

It is an arithmetic number, because the mean of its divisors is an integer number (22976044).

Almost surely, 2^91399027 is an apocalyptic number.

91399027 is a deficient number, since it is larger than the sum of its proper divisors (505149).

91399027 is a wasteful number, since it uses less digits than its factorization.

91399027 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 505148.

The product of its (nonzero) digits is 30618, while the sum is 40.

The square root of 91399027 is about 9560.2838346986. The cubic root of 91399027 is about 450.4506218558.

The spelling of 91399027 in words is "ninety-one million, three hundred ninety-nine thousand, twenty-seven".