1251697 has 2 divisors, whose sum is σ = 1251698. Its totient is φ = 1251696.

The previous prime is 1251671. The next prime is 1251703. The reversal of 1251697 is 7961521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1245456 + 6241 = 1116^2 + 79^2 .

It is an emirp because it is prime and its reverse (7961521) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1251697 - 2¹⁹ = 727409 is a prime.

It is not a weakly prime, because it can be changed into another prime (1251667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 625848 + 625849.

It is an arithmetic number, because the mean of its divisors is an integer number (625849).

2^1251697 is an apocalyptic number.

It is an amenable number.

1251697 is a deficient number, since it is larger than the sum of its proper divisors (1).

1251697 is an equidigital number, since it uses as much as digits as its factorization.

1251697 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3780, while the sum is 31.

The square root of 1251697 is about 1118.7926528182. The cubic root of 1251697 is about 107.7704601339.

The spelling of 1251697 in words is "one million, two hundred fifty-one thousand, six hundred ninety-seven".