9090145 has 8 divisors (see below), whose sum is σ = 10927080. Its totient is φ = 7259520.

The previous prime is 9090139. The next prime is 9090173. The reversal of 9090145 is 5410909.

It can be written as a sum of positive squares in 4 ways, for example, as 322624 + 8767521 = 568^2 + 2961^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 9090145 - 2⁷ = 9090017 is a prime.

It is a super-2 number, since 2×9090145² = 165261472242050, which contains 22 as substring.

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

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, 2611 + ... + 4999.

It is an arithmetic number, because the mean of its divisors is an integer number (1365885).

Almost surely, 2^9090145 is an apocalyptic number.

It is an amenable number.

9090145 is a deficient number, since it is larger than the sum of its proper divisors (1836935).

9090145 is a wasteful number, since it uses less digits than its factorization.

9090145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3155.

The product of its (nonzero) digits is 1620, while the sum is 28.

The square root of 9090145 is about 3014.9867329725. The cubic root of 9090145 is about 208.7005548208.

The spelling of 9090145 in words is "nine million, ninety thousand, one hundred forty-five".