91761427 has 4 divisors (see below), whose sum is σ = 97159176. Its totient is φ = 86363680.

The previous prime is 91761401. The next prime is 91761479. The reversal of 91761427 is 72416719.

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 91761427 - 2²³ = 83372819 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91761827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2698849 + ... + 2698882.

It is an arithmetic number, because the mean of its divisors is an integer number (24289794).

Almost surely, 2^91761427 is an apocalyptic number.

91761427 is a deficient number, since it is larger than the sum of its proper divisors (5397749).

91761427 is a wasteful number, since it uses less digits than its factorization.

91761427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5397748.

The product of its digits is 21168, while the sum is 37.

The square root of 91761427 is about 9579.2184963075. The cubic root of 91761427 is about 451.0451869907.

The spelling of 91761427 in words is "ninety-one million, seven hundred sixty-one thousand, four hundred twenty-seven".