91945261 has 4 divisors (see below), whose sum is σ = 92041312. Its totient is φ = 91849212.

The previous prime is 91945253. The next prime is 91945267. The reversal of 91945261 is 16254919.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16254919 = 1759 ⋅9241.

It is a cyclic number.

It is not a de Polignac number, because 91945261 - 2³ = 91945253 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 91945261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91945267) 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 3 ways as a sum of consecutive naturals, for example, 46575 + ... + 48508.

It is an arithmetic number, because the mean of its divisors is an integer number (23010328).

Almost surely, 2^91945261 is an apocalyptic number.

It is an amenable number.

91945261 is a deficient number, since it is larger than the sum of its proper divisors (96051).

91945261 is an equidigital number, since it uses as much as digits as its factorization.

91945261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96050.

The product of its digits is 19440, while the sum is 37.

The square root of 91945261 is about 9588.8091544258. The cubic root of 91945261 is about 451.3461926643.

The spelling of 91945261 in words is "ninety-one million, nine hundred forty-five thousand, two hundred sixty-one".