145090549 has 4 divisors (see below), whose sum is σ = 145132236. Its totient is φ = 145048864.

The previous prime is 145090541. The next prime is 145090553. The reversal of 145090549 is 945090541.

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 10692900 + 134397649 = 3270^2 + 11593^2 .

It is a cyclic number.

It is not a de Polignac number, because 145090549 - 2³ = 145090541 is a prime.

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

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145090541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15094 + ... + 22759.

It is an arithmetic number, because the mean of its divisors is an integer number (36283059).

Almost surely, 2^145090549 is an apocalyptic number.

It is an amenable number.

145090549 is a deficient number, since it is larger than the sum of its proper divisors (41687).

145090549 is an equidigital number, since it uses as much as digits as its factorization.

145090549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41686.

The product of its (nonzero) digits is 32400, while the sum is 37.

The square root of 145090549 is about 12045.3538345704. The cubic root of 145090549 is about 525.4681224539.

The spelling of 145090549 in words is "one hundred forty-five million, ninety thousand, five hundred forty-nine".