90985143 has 16 divisors (see below), whose sum is σ = 122967936. Its totient is φ = 59834400.

The previous prime is 90985123. The next prime is 90985157. The reversal of 90985143 is 34158909.

It is a de Polignac number, because none of the positive numbers 2^k-90985143 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90985123) 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, 141180 + ... + 141822.

It is an arithmetic number, because the mean of its divisors is an integer number (7685496).

Almost surely, 2^90985143 is an apocalyptic number.

90985143 is a deficient number, since it is larger than the sum of its proper divisors (31982793).

90985143 is a wasteful number, since it uses less digits than its factorization.

90985143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1214.

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

The square root of 90985143 is about 9538.6132639918. The cubic root of 90985143 is about 449.7696648377.

It can be divided in two parts, 9098 and 5143, that added together give a palindrome (14241).

The spelling of 90985143 in words is "ninety million, nine hundred eighty-five thousand, one hundred forty-three".