90743021 has 2 divisors, whose sum is σ = 90743022. Its totient is φ = 90743020.

The previous prime is 90743011. The next prime is 90743039. The reversal of 90743021 is 12034709.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60062500 + 30680521 = 7750^2 + 5539^2 .

It is an emirp because it is prime and its reverse (12034709) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90743021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90743011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45371510 + 45371511.

It is an arithmetic number, because the mean of its divisors is an integer number (45371511).

Almost surely, 2^90743021 is an apocalyptic number.

It is an amenable number.

90743021 is a deficient number, since it is larger than the sum of its proper divisors (1).

90743021 is an equidigital number, since it uses as much as digits as its factorization.

90743021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 90743021 is about 9525.9131320835. The cubic root of 90743021 is about 449.3703473668.

The spelling of 90743021 in words is "ninety million, seven hundred forty-three thousand, twenty-one".