890762221 has 2 divisors, whose sum is σ = 890762222. Its totient is φ = 890762220.

The previous prime is 890762219. The next prime is 890762227. The reversal of 890762221 is 122267098.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 529230025 + 361532196 = 23005^2 + 19014^2 .

It is a cyclic number.

It is not a de Polignac number, because 890762221 - 2¹ = 890762219 is a prime.

Together with 890762219, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (890762227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 445381110 + 445381111.

It is an arithmetic number, because the mean of its divisors is an integer number (445381111).

Almost surely, 2^890762221 is an apocalyptic number.

It is an amenable number.

890762221 is a deficient number, since it is larger than the sum of its proper divisors (1).

890762221 is an equidigital number, since it uses as much as digits as its factorization.

890762221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 890762221 is about 29845.6398993220. The cubic root of 890762221 is about 962.1746926956.

The spelling of 890762221 in words is "eight hundred ninety million, seven hundred sixty-two thousand, two hundred twenty-one".