1205042513 has 4 divisors (see below), whose sum is σ = 1205112048. Its totient is φ = 1204972980.

The previous prime is 1205042507. The next prime is 1205042533. The reversal of 1205042513 is 3152405021.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 3152405021 = 50101 ⋅62921.

It is a cyclic number.

It is not a de Polignac number, because 1205042513 - 2⁴ = 1205042497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1205042533) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14498 + ... + 51188.

It is an arithmetic number, because the mean of its divisors is an integer number (301278012).

Almost surely, 2^1205042513 is an apocalyptic number.

It is an amenable number.

1205042513 is a deficient number, since it is larger than the sum of its proper divisors (69535).

1205042513 is an equidigital number, since it uses as much as digits as its factorization.

1205042513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69534.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 1205042513 is about 34713.7222579198. The cubic root of 1205042513 is about 1064.1449529394.

Adding to 1205042513 its reverse (3152405021), we get a palindrome (4357447534).

The spelling of 1205042513 in words is "one billion, two hundred five million, forty-two thousand, five hundred thirteen".