90821613 has 8 divisors (see below), whose sum is σ = 121378176. Its totient is φ = 60406400.

The previous prime is 90821611. The next prime is 90821659. The reversal of 90821613 is 31612809.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 90821613 - 2¹ = 90821611 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90821611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33828 + ... + 36413.

It is an arithmetic number, because the mean of its divisors is an integer number (15172272).

Almost surely, 2^90821613 is an apocalyptic number.

It is an amenable number.

90821613 is a deficient number, since it is larger than the sum of its proper divisors (30556563).

90821613 is a wasteful number, since it uses less digits than its factorization.

90821613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70675.

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 90821613 is about 9530.0374081113. The cubic root of 90821613 is about 449.5000422750.

The spelling of 90821613 in words is "ninety million, eight hundred twenty-one thousand, six hundred thirteen".