1771791851 has 2 divisors, whose sum is σ = 1771791852. Its totient is φ = 1771791850.

The previous prime is 1771791809. The next prime is 1771791877. The reversal of 1771791851 is 1581971771.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1771791851 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1771791796 and 1771791805.

It is not a weakly prime, because it can be changed into another prime (1771799851) 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, 885895925 + 885895926.

It is an arithmetic number, because the mean of its divisors is an integer number (885895926).

Almost surely, 2^1771791851 is an apocalyptic number.

1771791851 is a deficient number, since it is larger than the sum of its proper divisors (1).

1771791851 is an equidigital number, since it uses as much as digits as its factorization.

1771791851 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 123480, while the sum is 47.

The square root of 1771791851 is about 42092.6579227304. The cubic root of 1771791851 is about 1210.0525558303.

The spelling of 1771791851 in words is "one billion, seven hundred seventy-one million, seven hundred ninety-one thousand, eight hundred fifty-one".