1251851 has 2 divisors, whose sum is σ = 1251852. Its totient is φ = 1251850.

The previous prime is 1251841. The next prime is 1251857. The reversal of 1251851 is 1581521.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1251851 - 2⁶ = 1251787 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1251857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 625925 + 625926.

It is an arithmetic number, because the mean of its divisors is an integer number (625926).

2^1251851 is an apocalyptic number.

1251851 is a deficient number, since it is larger than the sum of its proper divisors (1).

1251851 is an equidigital number, since it uses as much as digits as its factorization.

1251851 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 1251851 is about 1118.8614748931. The cubic root of 1251851 is about 107.7748797259.

It can be divided in two parts, 1251 and 851, that multiplied together give a palindrome (1064601).

The spelling of 1251851 in words is "one million, two hundred fifty-one thousand, eight hundred fifty-one".