1205513 has 2 divisors, whose sum is σ = 1205514. Its totient is φ = 1205512.

The previous prime is 1205489. The next prime is 1205527. The reversal of 1205513 is 3155021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 906304 + 299209 = 952^2 + 547^2 .

It is an emirp because it is prime and its reverse (3155021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1205513 - 2⁸ = 1205257 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1205491 and 1205500.

It is not a weakly prime, because it can be changed into another prime (1205563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 602756 + 602757.

It is an arithmetic number, because the mean of its divisors is an integer number (602757).

2^1205513 is an apocalyptic number.

It is an amenable number.

1205513 is a deficient number, since it is larger than the sum of its proper divisors (1).

1205513 is an equidigital number, since it uses as much as digits as its factorization.

1205513 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 150, while the sum is 17.

The square root of 1205513 is about 1097.9585602380. The cubic root of 1205513 is about 106.4283426954.

The spelling of 1205513 in words is "one million, two hundred five thousand, five hundred thirteen".