91349815 has 16 divisors (see below), whose sum is σ = 115624800. Its totient is φ = 69092352.

The previous prime is 91349803. The next prime is 91349821. The reversal of 91349815 is 51894319.

It is a cyclic number.

It is not a de Polignac number, because 91349815 - 2¹³ = 91341623 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 90031 + ... + 91039.

It is an arithmetic number, because the mean of its divisors is an integer number (7226550).

Almost surely, 2^91349815 is an apocalyptic number.

91349815 is a gapful number since it is divisible by the number (95) formed by its first and last digit.

91349815 is a deficient number, since it is larger than the sum of its proper divisors (24274985).

91349815 is a wasteful number, since it uses less digits than its factorization.

91349815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1986.

The product of its digits is 38880, while the sum is 40.

The square root of 91349815 is about 9557.7097151985. The cubic root of 91349815 is about 450.3697619295.

The spelling of 91349815 in words is "ninety-one million, three hundred forty-nine thousand, eight hundred fifteen".