91313566 has 4 divisors (see below), whose sum is σ = 136970352. Its totient is φ = 45656782.

The previous prime is 91313557. The next prime is 91313567. The reversal of 91313566 is 66531319.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91313567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22828390 + ... + 22828393.

It is an arithmetic number, because the mean of its divisors is an integer number (34242588).

Almost surely, 2^91313566 is an apocalyptic number.

91313566 is a deficient number, since it is larger than the sum of its proper divisors (45656786).

91313566 is a wasteful number, since it uses less digits than its factorization.

91313566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45656785.

The product of its digits is 14580, while the sum is 34.

The square root of 91313566 is about 9555.8132045368. The cubic root of 91313566 is about 450.3101828511.

The spelling of 91313566 in words is "ninety-one million, three hundred thirteen thousand, five hundred sixty-six".