90142543 has 4 divisors (see below), whose sum is σ = 94061808. Its totient is φ = 86223280.

The previous prime is 90142529. The next prime is 90142561. The reversal of 90142543 is 34524109.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 90142543 - 2⁵ = 90142511 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 (90142243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1959598 + ... + 1959643.

It is an arithmetic number, because the mean of its divisors is an integer number (23515452).

Almost surely, 2^90142543 is an apocalyptic number.

90142543 is a deficient number, since it is larger than the sum of its proper divisors (3919265).

90142543 is a wasteful number, since it uses less digits than its factorization.

90142543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3919264.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 90142543 is about 9494.3426839355. The cubic root of 90142543 is about 448.3769398153.

The spelling of 90142543 in words is "ninety million, one hundred forty-two thousand, five hundred forty-three".