90540481 has 2 divisors, whose sum is σ = 90540482. Its totient is φ = 90540480.

The previous prime is 90540451. The next prime is 90540547. The reversal of 90540481 is 18404509.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 80712256 + 9828225 = 8984^2 + 3135^2 .

It is an emirp because it is prime and its reverse (18404509) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90540481 - 2⁵ = 90540449 is a prime.

It is a super-2 number, since 2×90540481² = 16395157399422722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (90540421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45270240 + 45270241.

It is an arithmetic number, because the mean of its divisors is an integer number (45270241).

Almost surely, 2^90540481 is an apocalyptic number.

It is an amenable number.

90540481 is a deficient number, since it is larger than the sum of its proper divisors (1).

90540481 is an equidigital number, since it uses as much as digits as its factorization.

90540481 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 90540481 is about 9515.2761914723. The cubic root of 90540481 is about 449.0357641696.

The spelling of 90540481 in words is "ninety million, five hundred forty thousand, four hundred eighty-one".