91245905 has 4 divisors (see below), whose sum is σ = 109495092. Its totient is φ = 72996720.

The previous prime is 91245887. The next prime is 91245907. The reversal of 91245905 is 50954219.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 48330304 + 42915601 = 6952^2 + 6551^2 .

It is not a de Polignac number, because 91245905 - 2¹² = 91241809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91245907) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9124586 + ... + 9124595.

It is an arithmetic number, because the mean of its divisors is an integer number (27373773).

Almost surely, 2^91245905 is an apocalyptic number.

It is an amenable number.

91245905 is a deficient number, since it is larger than the sum of its proper divisors (18249187).

91245905 is a wasteful number, since it uses less digits than its factorization.

91245905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18249186.

The product of its (nonzero) digits is 16200, while the sum is 35.

The square root of 91245905 is about 9552.2722427703. The cubic root of 91245905 is about 450.1989326205.

The spelling of 91245905 in words is "ninety-one million, two hundred forty-five thousand, nine hundred five".