1327561 has 2 divisors, whose sum is σ = 1327562. Its totient is φ = 1327560.

The previous prime is 1327517. The next prime is 1327577. The reversal of 1327561 is 1657231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1279161 + 48400 = 1131^2 + 220^2 .

It is an emirp because it is prime and its reverse (1657231) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1327561 - 2¹⁹ = 803273 is a prime.

1327561 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (1357561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 663780 + 663781.

It is an arithmetic number, because the mean of its divisors is an integer number (663781).

2^1327561 is an apocalyptic number.

It is an amenable number.

1327561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1327561 is an equidigital number, since it uses as much as digits as its factorization.

1327561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1260, while the sum is 25.

The square root of 1327561 is about 1152.1983336214. The cubic root of 1327561 is about 109.9051799966.

It can be divided in two parts, 1327 and 561, that multiplied together give a palindrome (744447).

The spelling of 1327561 in words is "one million, three hundred twenty-seven thousand, five hundred sixty-one".