1920437851 has 2 divisors, whose sum is σ = 1920437852. Its totient is φ = 1920437850.

The previous prime is 1920437843. The next prime is 1920437873. The reversal of 1920437851 is 1587340291.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1920437851 - 2³ = 1920437843 is a prime.

It is not a weakly prime, because it can be changed into another prime (1920437821) 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, 960218925 + 960218926.

It is an arithmetic number, because the mean of its divisors is an integer number (960218926).

Almost surely, 2^1920437851 is an apocalyptic number.

1920437851 is a deficient number, since it is larger than the sum of its proper divisors (1).

1920437851 is an equidigital number, since it uses as much as digits as its factorization.

1920437851 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60480, while the sum is 40.

The square root of 1920437851 is about 43822.8005837144. The cubic root of 1920437851 is about 1242.9874747047.

The spelling of 1920437851 in words is "one billion, nine hundred twenty million, four hundred thirty-seven thousand, eight hundred fifty-one".