90271813 has 2 divisors, whose sum is σ = 90271814. Its totient is φ = 90271812.

The previous prime is 90271777. The next prime is 90271843. The reversal of 90271813 is 31817209.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72982849 + 17288964 = 8543^2 + 4158^2 .

It is a cyclic number.

It is not a de Polignac number, because 90271813 - 2¹⁷ = 90140741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90271843) 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 as a sum of consecutive naturals, namely, 45135906 + 45135907.

It is an arithmetic number, because the mean of its divisors is an integer number (45135907).

Almost surely, 2^90271813 is an apocalyptic number.

It is an amenable number.

90271813 is a deficient number, since it is larger than the sum of its proper divisors (1).

90271813 is an equidigital number, since it uses as much as digits as its factorization.

90271813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 90271813 is about 9501.1479832702. The cubic root of 90271813 is about 448.5911708921.

The spelling of 90271813 in words is "ninety million, two hundred seventy-one thousand, eight hundred thirteen".