91471555 has 16 divisors (see below), whose sum is σ = 127168704. Its totient is φ = 61862400.

The previous prime is 91471553. The next prime is 91471609. The reversal of 91471555 is 55517419.

It is not a de Polignac number, because 91471555 - 2¹ = 91471553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91471553) 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 15 ways as a sum of consecutive naturals, for example, 15346 + ... + 20455.

It is an arithmetic number, because the mean of its divisors is an integer number (7948044).

Almost surely, 2^91471555 is an apocalyptic number.

91471555 is a deficient number, since it is larger than the sum of its proper divisors (35697149).

91471555 is a wasteful number, since it uses less digits than its factorization.

91471555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35886.

The product of its digits is 31500, while the sum is 37.

The square root of 91471555 is about 9564.0762753127. The cubic root of 91471555 is about 450.5697392613.

The spelling of 91471555 in words is "ninety-one million, four hundred seventy-one thousand, five hundred fifty-five".