90985534 has 4 divisors (see below), whose sum is σ = 136478304. Its totient is φ = 45492766.

The previous prime is 90985523. The next prime is 90985537. The reversal of 90985534 is 43558909.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 43558909 = 409 ⋅106501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90985537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22746382 + ... + 22746385.

It is an arithmetic number, because the mean of its divisors is an integer number (34119576).

Almost surely, 2^90985534 is an apocalyptic number.

90985534 is a deficient number, since it is larger than the sum of its proper divisors (45492770).

90985534 is a wasteful number, since it uses less digits than its factorization.

90985534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45492769.

The product of its (nonzero) digits is 194400, while the sum is 43.

The square root of 90985534 is about 9538.6337596115. The cubic root of 90985534 is about 449.7703091176.

It can be divided in two parts, 90985 and 534, that added together give a palindrome (91519).

The spelling of 90985534 in words is "ninety million, nine hundred eighty-five thousand, five hundred thirty-four".