90442549 has 4 divisors (see below), whose sum is σ = 91320736. Its totient is φ = 89564364.

The previous prime is 90442537. The next prime is 90442577. The reversal of 90442549 is 94524409.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 94524409 = 7 ⋅13503487.

It is a cyclic number.

It is not a de Polignac number, because 90442549 - 2⁷ = 90442421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90442349) 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, 438939 + ... + 439144.

It is an arithmetic number, because the mean of its divisors is an integer number (22830184).

Almost surely, 2^90442549 is an apocalyptic number.

It is an amenable number.

90442549 is a deficient number, since it is larger than the sum of its proper divisors (878187).

90442549 is a wasteful number, since it uses less digits than its factorization.

90442549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 878186.

The product of its (nonzero) digits is 51840, while the sum is 37.

The square root of 90442549 is about 9510.1287583292. The cubic root of 90442549 is about 448.8738077551.

The spelling of 90442549 in words is "ninety million, four hundred forty-two thousand, five hundred forty-nine".