90821711 has 2 divisors, whose sum is σ = 90821712. Its totient is φ = 90821710.

The previous prime is 90821669. The next prime is 90821737. The reversal of 90821711 is 11712809.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90821711 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90821761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45410855 + 45410856.

It is an arithmetic number, because the mean of its divisors is an integer number (45410856).

Almost surely, 2^90821711 is an apocalyptic number.

90821711 is a deficient number, since it is larger than the sum of its proper divisors (1).

90821711 is an equidigital number, since it uses as much as digits as its factorization.

90821711 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 29.

The square root of 90821711 is about 9530.0425497476. The cubic root of 90821711 is about 449.5002039508.

The spelling of 90821711 in words is "ninety million, eight hundred twenty-one thousand, seven hundred eleven".