9090545 has 4 divisors (see below), whose sum is σ = 10908660. Its totient is φ = 7272432.

The previous prime is 9090539. The next prime is 9090547. The reversal of 9090545 is 5450909.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5450909 = 41 ⋅132949.

It can be written as a sum of positive squares in 2 ways, for example, as 4355569 + 4734976 = 2087^2 + 2176^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9090545 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (9090547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 909050 + ... + 909059.

It is an arithmetic number, because the mean of its divisors is an integer number (2727165).

Almost surely, 2^9090545 is an apocalyptic number.

It is an amenable number.

9090545 is a deficient number, since it is larger than the sum of its proper divisors (1818115).

9090545 is a wasteful number, since it uses less digits than its factorization.

9090545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1818114.

The product of its (nonzero) digits is 8100, while the sum is 32.

The square root of 9090545 is about 3015.0530675263. The cubic root of 9090545 is about 208.7036159747.

The spelling of 9090545 in words is "nine million, ninety thousand, five hundred forty-five".