91204605 has 12 divisors (see below), whose sum is σ = 158088060. Its totient is φ = 48642432.

The previous prime is 91204571. The next prime is 91204639. The reversal of 91204605 is 50640219.

It is an interprime number because it is at equal distance from previous prime (91204571) and next prime (91204639).

It can be written as a sum of positive squares in 2 ways, for example, as 10150596 + 81054009 = 3186^2 + 9003^2 .

It is not a de Polignac number, because 91204605 - 2¹² = 91200509 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1013340 + ... + 1013429.

It is an arithmetic number, because the mean of its divisors is an integer number (13174005).

Almost surely, 2^91204605 is an apocalyptic number.

It is an amenable number.

91204605 is a deficient number, since it is larger than the sum of its proper divisors (66883455).

91204605 is a wasteful number, since it uses less digits than its factorization.

91204605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2026780 (or 2026777 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 91204605 is about 9550.1102087882. The cubic root of 91204605 is about 450.1309988984.

It can be divided in two parts, 91204 and 605, that added together give a square (91809 = 303²).

The spelling of 91204605 in words is "ninety-one million, two hundred four thousand, six hundred five".