90689509 has 4 divisors (see below), whose sum is σ = 96024204. Its totient is φ = 85354816.

The previous prime is 90689449. The next prime is 90689531. The reversal of 90689509 is 90598609.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 71740900 + 18948609 = 8470^2 + 4353^2 .

It is a cyclic number.

It is not a de Polignac number, because 90689509 - 2¹¹ = 90687461 is a prime.

It is a super-2 number, since 2×90689509² = 16449174085322162, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90689569) 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, 2667322 + ... + 2667355.

It is an arithmetic number, because the mean of its divisors is an integer number (24006051).

Almost surely, 2^90689509 is an apocalyptic number.

It is an amenable number.

90689509 is a deficient number, since it is larger than the sum of its proper divisors (5334695).

90689509 is a wasteful number, since it uses less digits than its factorization.

90689509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5334694.

The product of its (nonzero) digits is 174960, while the sum is 46.

The square root of 90689509 is about 9523.1039582691. The cubic root of 90689509 is about 449.2819973789.

The spelling of 90689509 in words is "ninety million, six hundred eighty-nine thousand, five hundred nine".