1315661 has 2 divisors, whose sum is σ = 1315662. Its totient is φ = 1315660.

The previous prime is 1315651. The next prime is 1315673. The reversal of 1315661 is 1665131.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 866761 + 448900 = 931^2 + 670^2 .

It is a cyclic number.

It is not a de Polignac number, because 1315661 - 2⁶ = 1315597 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1315621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 657830 + 657831.

It is an arithmetic number, because the mean of its divisors is an integer number (657831).

2^1315661 is an apocalyptic number.

It is an amenable number.

1315661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1315661 is an equidigital number, since it uses as much as digits as its factorization.

1315661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 540, while the sum is 23.

The square root of 1315661 is about 1147.0226676051. The cubic root of 1315661 is about 109.5758042829.

The spelling of 1315661 in words is "one million, three hundred fifteen thousand, six hundred sixty-one".