91057205 has 8 divisors (see below), whose sum is σ = 109383000. Its totient is φ = 72769536.

The previous prime is 91057193. The next prime is 91057223. The reversal of 91057205 is 50275019.

It can be written as a sum of positive squares in 4 ways, for example, as 15697444 + 75359761 = 3962^2 + 8681^2 .

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 91057205 - 2¹⁴ = 91040821 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3980 + ... + 14069.

It is an arithmetic number, because the mean of its divisors is an integer number (13672875).

Almost surely, 2^91057205 is an apocalyptic number.

It is an amenable number.

91057205 is a deficient number, since it is larger than the sum of its proper divisors (18325795).

91057205 is a wasteful number, since it uses less digits than its factorization.

91057205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19063.

The product of its (nonzero) digits is 3150, while the sum is 29.

The square root of 91057205 is about 9542.3898998102. The cubic root of 91057205 is about 449.8883756056. Note that the first 3 decimals are identical.

The spelling of 91057205 in words is "ninety-one million, fifty-seven thousand, two hundred five".