2511851 has 2 divisors, whose sum is σ = 2511852. Its totient is φ = 2511850.

The previous prime is 2511827. The next prime is 2511871. The reversal of 2511851 is 1581152.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2511851 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2511811) 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, 1255925 + 1255926.

It is an arithmetic number, because the mean of its divisors is an integer number (1255926).

2^2511851 is an apocalyptic number.

2511851 is a deficient number, since it is larger than the sum of its proper divisors (1).

2511851 is an equidigital number, since it uses as much as digits as its factorization.

2511851 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 400, while the sum is 23.

The square root of 2511851 is about 1584.8820145361. The cubic root of 2511851 is about 135.9349999364.

The spelling of 2511851 in words is "two million, five hundred eleven thousand, eight hundred fifty-one".