1278601 has 2 divisors, whose sum is σ = 1278602. Its totient is φ = 1278600.

The previous prime is 1278583. The next prime is 1278611. The reversal of 1278601 is 1068721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 767376 + 511225 = 876^2 + 715^2 .

It is an emirp because it is prime and its reverse (1068721) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1278601 - 2¹⁵ = 1245833 is a prime.

It is an Ulam number.

1278601 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (1278611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 639300 + 639301.

It is an arithmetic number, because the mean of its divisors is an integer number (639301).

2^1278601 is an apocalyptic number.

It is an amenable number.

1278601 is a deficient number, since it is larger than the sum of its proper divisors (1).

1278601 is an equidigital number, since it uses as much as digits as its factorization.

1278601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 672, while the sum is 25.

The square root of 1278601 is about 1130.7524043751. The cubic root of 1278601 is about 108.5371332618.

The spelling of 1278601 in words is "one million, two hundred seventy-eight thousand, six hundred one".