1251671 has 2 divisors, whose sum is σ = 1251672. Its totient is φ = 1251670.

The previous prime is 1251667. The next prime is 1251697. The reversal of 1251671 is 1761521.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1251671 - 2² = 1251667 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1251641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 625835 + 625836.

It is an arithmetic number, because the mean of its divisors is an integer number (625836).

2^1251671 is an apocalyptic number.

1251671 is a deficient number, since it is larger than the sum of its proper divisors (1).

1251671 is an equidigital number, since it uses as much as digits as its factorization.

1251671 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 420, while the sum is 23.

The square root of 1251671 is about 1118.7810330891. The cubic root of 1251671 is about 107.7697139332.

The spelling of 1251671 in words is "one million, two hundred fifty-one thousand, six hundred seventy-one".