91242405 has 12 divisors (see below), whose sum is σ = 158153580. Its totient is φ = 48662592.

The previous prime is 91242391. The next prime is 91242421. The reversal of 91242405 is 50424219.

It can be written as a sum of positive squares in 2 ways, for example, as 21986721 + 69255684 = 4689^2 + 8322^2 .

It is not a de Polignac number, because 91242405 - 2⁵ = 91242373 is a prime.

It is a Curzon number.

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, 1013760 + ... + 1013849.

It is an arithmetic number, because the mean of its divisors is an integer number (13179465).

Almost surely, 2^91242405 is an apocalyptic number.

It is an amenable number.

91242405 is a deficient number, since it is larger than the sum of its proper divisors (66911175).

91242405 is a wasteful number, since it uses less digits than its factorization.

91242405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2027620 (or 2027617 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 91242405 is about 9552.0890385297. The cubic root of 91242405 is about 450.1931763205.

The spelling of 91242405 in words is "ninety-one million, two hundred forty-two thousand, four hundred five".