91188479 has 2 divisors, whose sum is σ = 91188480. Its totient is φ = 91188478.

The previous prime is 91188463. The next prime is 91188497. The reversal of 91188479 is 97488119.

Together with next prime (91188497) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91188479 - 2⁴ = 91188463 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91188679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45594239 + 45594240.

It is an arithmetic number, because the mean of its divisors is an integer number (45594240).

Almost surely, 2^91188479 is an apocalyptic number.

91188479 is a deficient number, since it is larger than the sum of its proper divisors (1).

91188479 is an equidigital number, since it uses as much as digits as its factorization.

91188479 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145152, while the sum is 47.

The square root of 91188479 is about 9549.2658880146. The cubic root of 91188479 is about 450.1044679269.

The spelling of 91188479 in words is "ninety-one million, one hundred eighty-eight thousand, four hundred seventy-nine".