90981543 has 4 divisors (see below), whose sum is σ = 121308728. Its totient is φ = 60654360.

The previous prime is 90981533. The next prime is 90981571. The reversal of 90981543 is 34518909.

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

It is not a de Polignac number, because 90981543 - 2⁶ = 90981479 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 (90981523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15163588 + ... + 15163593.

It is an arithmetic number, because the mean of its divisors is an integer number (30327182).

Almost surely, 2^90981543 is an apocalyptic number.

90981543 is a deficient number, since it is larger than the sum of its proper divisors (30327185).

90981543 is a wasteful number, since it uses less digits than its factorization.

90981543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30327184.

The product of its (nonzero) digits is 38880, while the sum is 39.

The square root of 90981543 is about 9538.4245554494. The cubic root of 90981543 is about 449.7637327625.

The spelling of 90981543 in words is "ninety million, nine hundred eighty-one thousand, five hundred forty-three".