90561217 has 8 divisors (see below), whose sum is σ = 92363040. Its totient is φ = 88776480.

The previous prime is 90561209. The next prime is 90561223. The reversal of 90561217 is 71216509.

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 90561217 - 2³ = 90561209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90561257) 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, 6709 + ... + 15037.

It is an arithmetic number, because the mean of its divisors is an integer number (11545380).

Almost surely, 2^90561217 is an apocalyptic number.

It is an amenable number.

90561217 is a deficient number, since it is larger than the sum of its proper divisors (1801823).

90561217 is a wasteful number, since it uses less digits than its factorization.

90561217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8543.

The product of its (nonzero) digits is 3780, while the sum is 31.

The square root of 90561217 is about 9516.3657453883. The cubic root of 90561217 is about 449.0700416359.

The spelling of 90561217 in words is "ninety million, five hundred sixty-one thousand, two hundred seventeen".