91961055 has 32 divisors (see below), whose sum is σ = 164505600. Its totient is φ = 48740256.

The previous prime is 91961053. The next prime is 91961057. The reversal of 91961055 is 55016919.

It is an interprime number because it is at equal distance from previous prime (91961053) and next prime (91961057).

It is not a de Polignac number, because 91961055 - 2¹ = 91961053 is a prime.

It is a super-3 number, since 3×91961055³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91961053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20506 + ... + 24584.

It is an arithmetic number, because the mean of its divisors is an integer number (5140800).

Almost surely, 2^91961055 is an apocalyptic number.

91961055 is a deficient number, since it is larger than the sum of its proper divisors (72544545).

91961055 is a wasteful number, since it uses less digits than its factorization.

91961055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4260 (or 4254 counting only the distinct ones).

The product of its (nonzero) digits is 12150, while the sum is 36.

The square root of 91961055 is about 9589.6326832679. The cubic root of 91961055 is about 451.3720346836.

The spelling of 91961055 in words is "ninety-one million, nine hundred sixty-one thousand, fifty-five".