90563281 has 4 divisors (see below), whose sum is σ = 90806452. Its totient is φ = 90320112.

The previous prime is 90563279. The next prime is 90563287. The reversal of 90563281 is 18236509.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 50126400 + 40436881 = 7080^2 + 6359^2 .

It is a cyclic number.

It is not a de Polignac number, because 90563281 - 2¹ = 90563279 is a prime.

It is a super-2 number, since 2×90563281² = 16403415730969922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90563287) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121026 + ... + 121771.

It is an arithmetic number, because the mean of its divisors is an integer number (22701613).

Almost surely, 2^90563281 is an apocalyptic number.

It is an amenable number.

90563281 is a deficient number, since it is larger than the sum of its proper divisors (243171).

90563281 is a wasteful number, since it uses less digits than its factorization.

90563281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243170.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 90563281 is about 9516.4741895305. The cubic root of 90563281 is about 449.0734532270.

The spelling of 90563281 in words is "ninety million, five hundred sixty-three thousand, two hundred eighty-one".