91830487 has 4 divisors (see below), whose sum is σ = 104949136. Its totient is φ = 78711840.

The previous prime is 91830449. The next prime is 91830493. The reversal of 91830487 is 78403819.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78403819 = 13 ⋅6031063.

It is a cyclic number.

It is not a de Polignac number, because 91830487 - 2¹¹ = 91828439 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91830187) 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, 6559314 + ... + 6559327.

It is an arithmetic number, because the mean of its divisors is an integer number (26237284).

Almost surely, 2^91830487 is an apocalyptic number.

91830487 is a deficient number, since it is larger than the sum of its proper divisors (13118649).

91830487 is a wasteful number, since it uses less digits than its factorization.

91830487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13118648.

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 91830487 is about 9582.8224965299. The cubic root of 91830487 is about 451.1583113922.

The spelling of 91830487 in words is "ninety-one million, eight hundred thirty thousand, four hundred eighty-seven".