90012549 has 16 divisors (see below), whose sum is σ = 135443520. Its totient is φ = 52671360.

The previous prime is 90012493. The next prime is 90012551. The reversal of 90012549 is 94521009.

It is a happy number.

It is not a de Polignac number, because 90012549 - 2⁹ = 90012037 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90012049) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46072 + ... + 47985.

It is an arithmetic number, because the mean of its divisors is an integer number (8465220).

Almost surely, 2^90012549 is an apocalyptic number.

It is an amenable number.

90012549 is a deficient number, since it is larger than the sum of its proper divisors (45430971).

90012549 is a wasteful number, since it uses less digits than its factorization.

90012549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94100.

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 90012549 is about 9487.4943478244. The cubic root of 90012549 is about 448.1613022611.

The spelling of 90012549 in words is "ninety million, twelve thousand, five hundred forty-nine".