1220322513 has 4 divisors (see below), whose sum is σ = 1627096688. Its totient is φ = 813548340.

The previous prime is 1220322487. The next prime is 1220322527. The reversal of 1220322513 is 3152230221.

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.

It is not a de Polignac number, because 1220322513 - 2⁶ = 1220322449 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1220322513.

It is not an unprimeable number, because it can be changed into a prime (1220322563) 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, 203387083 + ... + 203387088.

It is an arithmetic number, because the mean of its divisors is an integer number (406774172).

Almost surely, 2^1220322513 is an apocalyptic number.

It is an amenable number.

1220322513 is a deficient number, since it is larger than the sum of its proper divisors (406774175).

1220322513 is an equidigital number, since it uses as much as digits as its factorization.

1220322513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406774174.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 1220322513 is about 34933.1148482353. The cubic root of 1220322513 is about 1068.6238788829.

Adding to 1220322513 its reverse (3152230221), we get a palindrome (4372552734).

It can be divided in two parts, 12203 and 22513, that added together give a triangular number (34716 = T₂₆₃).

The spelling of 1220322513 in words is "one billion, two hundred twenty million, three hundred twenty-two thousand, five hundred thirteen".