90581563 has 2 divisors, whose sum is σ = 90581564. Its totient is φ = 90581562.

The previous prime is 90581551. The next prime is 90581573. The reversal of 90581563 is 36518509.

It is a strong prime.

It is an emirp because it is prime and its reverse (36518509) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90581563 - 2¹⁷ = 90450491 is a prime.

It is not a weakly prime, because it can be changed into another prime (90581573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45290781 + 45290782.

It is an arithmetic number, because the mean of its divisors is an integer number (45290782).

Almost surely, 2^90581563 is an apocalyptic number.

90581563 is a deficient number, since it is larger than the sum of its proper divisors (1).

90581563 is an equidigital number, since it uses as much as digits as its factorization.

90581563 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32400, while the sum is 37.

The square root of 90581563 is about 9517.4346858804. The cubic root of 90581563 is about 449.1036693307.

The spelling of 90581563 in words is "ninety million, five hundred eighty-one thousand, five hundred sixty-three".