1920851 has 2 divisors, whose sum is σ = 1920852. Its totient is φ = 1920850.

The previous prime is 1920839. The next prime is 1920859. The reversal of 1920851 is 1580291.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1920851 - 2¹⁴ = 1904467 is a prime.

It is equal to p₁₄₃₄₇₇ and since 1920851 and 143477 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1920851.

It is not a weakly prime, because it can be changed into another prime (1920859) 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, 960425 + 960426.

It is an arithmetic number, because the mean of its divisors is an integer number (960426).

2^1920851 is an apocalyptic number.

1920851 is a deficient number, since it is larger than the sum of its proper divisors (1).

1920851 is an equidigital number, since it uses as much as digits as its factorization.

1920851 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 26.

The square root of 1920851 is about 1385.9476902106. The cubic root of 1920851 is about 124.3076604068.

The spelling of 1920851 in words is "one million, nine hundred twenty thousand, eight hundred fifty-one".