1205031513 has 16 divisors (see below), whose sum is σ = 1861394816. Its totient is φ = 679155840.

The previous prime is 1205031493. The next prime is 1205031521. The reversal of 1205031513 is 3151305021.

It is not a de Polignac number, because 1205031513 - 2⁵ = 1205031481 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1205031513.

It is not an unprimeable number, because it can be changed into a prime (1205031523) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 391498 + ... + 394563.

It is an arithmetic number, because the mean of its divisors is an integer number (116337176).

Almost surely, 2^1205031513 is an apocalyptic number.

It is an amenable number.

1205031513 is a deficient number, since it is larger than the sum of its proper divisors (656363303).

1205031513 is an equidigital number, since it uses as much as digits as its factorization.

1205031513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 786144.

The product of its (nonzero) digits is 450, while the sum is 21.

The square root of 1205031513 is about 34713.5638187726. The cubic root of 1205031513 is about 1064.1417149817.

Adding to 1205031513 its reverse (3151305021), we get a palindrome (4356336534).

The spelling of 1205031513 in words is "one billion, two hundred five million, thirty-one thousand, five hundred thirteen".