90820243 has 2 divisors, whose sum is σ = 90820244. Its totient is φ = 90820242.

The previous prime is 90820231. The next prime is 90820259. The reversal of 90820243 is 34202809.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 90820243 - 2⁹ = 90819731 is a prime.

It is not a weakly prime, because it can be changed into another prime (90820843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45410121 + 45410122.

It is an arithmetic number, because the mean of its divisors is an integer number (45410122).

Almost surely, 2^90820243 is an apocalyptic number.

90820243 is a deficient number, since it is larger than the sum of its proper divisors (1).

90820243 is an equidigital number, since it uses as much as digits as its factorization.

90820243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 90820243 is about 9529.9655298432. The cubic root of 90820243 is about 449.4977821002.

The spelling of 90820243 in words is "ninety million, eight hundred twenty thousand, two hundred forty-three".