91126221 has 4 divisors (see below), whose sum is σ = 121501632. Its totient is φ = 60750812.

The previous prime is 91126201. The next prime is 91126237. The reversal of 91126221 is 12262119.

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: 12262119 = 3 ⋅4087373.

It is a cyclic number.

It is not a de Polignac number, because 91126221 - 2²¹ = 89029069 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 91126191 and 91126200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91126201) 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, 15187701 + ... + 15187706.

It is an arithmetic number, because the mean of its divisors is an integer number (30375408).

Almost surely, 2^91126221 is an apocalyptic number.

It is an amenable number.

91126221 is a deficient number, since it is larger than the sum of its proper divisors (30375411).

91126221 is a wasteful number, since it uses less digits than its factorization.

91126221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30375410.

The product of its digits is 432, while the sum is 24.

The square root of 91126221 is about 9546.0054996841. The cubic root of 91126221 is about 450.0020098676.

The spelling of 91126221 in words is "ninety-one million, one hundred twenty-six thousand, two hundred twenty-one".