91310261 has 4 divisors (see below), whose sum is σ = 104354592. Its totient is φ = 78265932.

The previous prime is 91310243. The next prime is 91310267. The reversal of 91310261 is 16201319.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 91310261 - 2¹⁰ = 91309237 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91310267) 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 3 ways as a sum of consecutive naturals, for example, 6522155 + ... + 6522168.

It is an arithmetic number, because the mean of its divisors is an integer number (26088648).

Almost surely, 2^91310261 is an apocalyptic number.

It is an amenable number.

91310261 is a deficient number, since it is larger than the sum of its proper divisors (13044331).

91310261 is a wasteful number, since it uses less digits than its factorization.

91310261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13044330.

The product of its (nonzero) digits is 324, while the sum is 23.

The square root of 91310261 is about 9555.6402715883. The cubic root of 91310261 is about 450.3047499486.

The spelling of 91310261 in words is "ninety-one million, three hundred ten thousand, two hundred sixty-one".