90345521 has 8 divisors (see below), whose sum is σ = 103886784. Its totient is φ = 76962960.

The previous prime is 90345511. The next prime is 90345553. The reversal of 90345521 is 12554309.

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 90345521 - 2¹⁰ = 90344497 is a prime.

It is a super-2 number, since 2×90345521² = 16324626329522882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90345511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38450 + ... + 40731.

It is an arithmetic number, because the mean of its divisors is an integer number (12985848).

Almost surely, 2^90345521 is an apocalyptic number.

It is an amenable number.

90345521 is a deficient number, since it is larger than the sum of its proper divisors (13541263).

90345521 is a wasteful number, since it uses less digits than its factorization.

90345521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79351.

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 90345521 is about 9505.0260914950. The cubic root of 90345521 is about 448.7132310043.

The spelling of 90345521 in words is "ninety million, three hundred forty-five thousand, five hundred twenty-one".