91348787 has 4 divisors (see below), whose sum is σ = 91747920. Its totient is φ = 90949656.

The previous prime is 91348729. The next prime is 91348841. The reversal of 91348787 is 78784319.

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 91348787 - 2¹² = 91344691 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91348717) 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, 199223 + ... + 199680.

It is an arithmetic number, because the mean of its divisors is an integer number (22936980).

Almost surely, 2^91348787 is an apocalyptic number.

91348787 is a deficient number, since it is larger than the sum of its proper divisors (399133).

91348787 is a wasteful number, since it uses less digits than its factorization.

91348787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 399132.

The product of its digits is 338688, while the sum is 47.

The square root of 91348787 is about 9557.6559364731. The cubic root of 91348787 is about 450.3680725196.

The spelling of 91348787 in words is "ninety-one million, three hundred forty-eight thousand, seven hundred eighty-seven".