1220523713 has 4 divisors (see below), whose sum is σ = 1220594628. Its totient is φ = 1220452800.

The previous prime is 1220523709. The next prime is 1220523751. The reversal of 1220523713 is 3173250221.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 503194624 + 717329089 = 22432^2 + 26783^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220523713 - 2² = 1220523709 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1220523763) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8645 + ... + 50157.

It is an arithmetic number, because the mean of its divisors is an integer number (305148657).

Almost surely, 2^1220523713 is an apocalyptic number.

It is an amenable number.

1220523713 is a deficient number, since it is larger than the sum of its proper divisors (70915).

1220523713 is an equidigital number, since it uses as much as digits as its factorization.

1220523713 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70914.

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 1220523713 is about 34935.9945185478. The cubic root of 1220523713 is about 1068.6826052460.

Adding to 1220523713 its reverse (3173250221), we get a palindrome (4393773934).

The spelling of 1220523713 in words is "one billion, two hundred twenty million, five hundred twenty-three thousand, seven hundred thirteen".