920821619 has 2 divisors, whose sum is σ = 920821620. Its totient is φ = 920821618.

The previous prime is 920821607. The next prime is 920821621. The reversal of 920821619 is 916128029.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-920821619 is a prime.

It is a super-2 number, since 2×920821619² = 1695824908035562322, which contains 22 as substring.

Together with 920821621, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (920821219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 460410809 + 460410810.

It is an arithmetic number, because the mean of its divisors is an integer number (460410810).

Almost surely, 2^920821619 is an apocalyptic number.

920821619 is a deficient number, since it is larger than the sum of its proper divisors (1).

920821619 is an equidigital number, since it uses as much as digits as its factorization.

920821619 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 38.

The square root of 920821619 is about 30345.0427417725. The cubic root of 920821619 is about 972.8782681373.

The spelling of 920821619 in words is "nine hundred twenty million, eight hundred twenty-one thousand, six hundred nineteen".