91555049 has 8 divisors (see below), whose sum is σ = 92324232. Its totient is φ = 90789120.

The previous prime is 91555039. The next prime is 91555069. The reversal of 91555049 is 94055519.

It can be written as a sum of positive squares in 4 ways, for example, as 2347024 + 89208025 = 1532^2 + 9445^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 91555049 - 2⁴ = 91555033 is a prime.

It is a super-3 number, since 3×91555049³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91555039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 106907 + ... + 107759.

It is an arithmetic number, because the mean of its divisors is an integer number (11540529).

Almost surely, 2^91555049 is an apocalyptic number.

It is an amenable number.

91555049 is a deficient number, since it is larger than the sum of its proper divisors (769183).

91555049 is a wasteful number, since it uses less digits than its factorization.

91555049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1627.

The product of its (nonzero) digits is 40500, while the sum is 38.

The square root of 91555049 is about 9568.4402595198. The cubic root of 91555049 is about 450.7067888950.

The spelling of 91555049 in words is "ninety-one million, five hundred fifty-five thousand, forty-nine".