1247641 has 2 divisors, whose sum is σ = 1247642. Its totient is φ = 1247640.

The previous prime is 1247627. The next prime is 1247651. The reversal of 1247641 is 1467421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 921600 + 326041 = 960^2 + 571^2 .

It is a cyclic number.

It is not a de Polignac number, because 1247641 - 2¹³ = 1239449 is a prime.

1247641 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (1247611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 623820 + 623821.

It is an arithmetic number, because the mean of its divisors is an integer number (623821).

2^1247641 is an apocalyptic number.

It is an amenable number.

1247641 is a deficient number, since it is larger than the sum of its proper divisors (1).

1247641 is an equidigital number, since it uses as much as digits as its factorization.

1247641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1344, while the sum is 25.

The square root of 1247641 is about 1116.9785136698. The cubic root of 1247641 is about 107.6539276762.

The spelling of 1247641 in words is "one million, two hundred forty-seven thousand, six hundred forty-one".