90443813 has 2 divisors, whose sum is σ = 90443814. Its totient is φ = 90443812.

The previous prime is 90443803. The next prime is 90443831. The reversal of 90443813 is 31834409.

Together with next prime (90443831) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 83484769 + 6959044 = 9137^2 + 2638^2 .

It is a cyclic number.

It is not a de Polignac number, because 90443813 - 2¹⁰ = 90442789 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 90443813.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90443803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45221906 + 45221907.

It is an arithmetic number, because the mean of its divisors is an integer number (45221907).

Almost surely, 2^90443813 is an apocalyptic number.

It is an amenable number.

90443813 is a deficient number, since it is larger than the sum of its proper divisors (1).

90443813 is an equidigital number, since it uses as much as digits as its factorization.

90443813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 90443813 is about 9510.1952135590. The cubic root of 90443813 is about 448.8758988574.

The spelling of 90443813 in words is "ninety million, four hundred forty-three thousand, eight hundred thirteen".