90217541 has 4 divisors (see below), whose sum is σ = 90247872. Its totient is φ = 90187212.

The previous prime is 90217531. The next prime is 90217553. The reversal of 90217541 is 14571209.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 14571209 = 31 ⋅470039.

It is a cyclic number.

It is not a de Polignac number, because 90217541 - 2¹⁰ = 90216517 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90217531) 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 3 ways as a sum of consecutive naturals, for example, 10151 + ... + 16836.

It is an arithmetic number, because the mean of its divisors is an integer number (22561968).

Almost surely, 2^90217541 is an apocalyptic number.

It is an amenable number.

90217541 is a deficient number, since it is larger than the sum of its proper divisors (30331).

90217541 is a wasteful number, since it uses less digits than its factorization.

90217541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30330.

The product of its (nonzero) digits is 2520, while the sum is 29.

The square root of 90217541 is about 9498.2914779449. The cubic root of 90217541 is about 448.5012542289.

The spelling of 90217541 in words is "ninety million, two hundred seventeen thousand, five hundred forty-one".