90219697 has 8 divisors (see below), whose sum is σ = 95940936. Its totient is φ = 84544512.

The previous prime is 90219617. The next prime is 90219737. The reversal of 90219697 is 79691209.

It can be written as a sum of positive squares in 4 ways, for example, as 29986576 + 60233121 = 5476^2 + 7761^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90219697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90219607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7428 + ... + 15349.

It is an arithmetic number, because the mean of its divisors is an integer number (11992617).

Almost surely, 2^90219697 is an apocalyptic number.

It is an amenable number.

90219697 is a deficient number, since it is larger than the sum of its proper divisors (5721239).

90219697 is a wasteful number, since it uses less digits than its factorization.

90219697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23027.

The product of its (nonzero) digits is 61236, while the sum is 43.

The square root of 90219697 is about 9498.4049713623. The cubic root of 90219697 is about 448.5048269303.

The spelling of 90219697 in words is "ninety million, two hundred nineteen thousand, six hundred ninety-seven".