1220455013 has 4 divisors (see below), whose sum is σ = 1232538828. Its totient is φ = 1208371200.

The previous prime is 1220454979. The next prime is 1220455021. The reversal of 1220455013 is 3105540221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 514064929 + 706390084 = 22673^2 + 26578^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220455013 - 2¹⁰ = 1220453989 is a prime.

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 1220455013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220455813) 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, 6041756 + ... + 6041957.

It is an arithmetic number, because the mean of its divisors is an integer number (308134707).

Almost surely, 2^1220455013 is an apocalyptic number.

It is an amenable number.

1220455013 is a deficient number, since it is larger than the sum of its proper divisors (12083815).

1220455013 is a wasteful number, since it uses less digits than its factorization.

1220455013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12083814.

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

The square root of 1220455013 is about 34935.0112780861. The cubic root of 1220455013 is about 1068.6625537791.

Adding to 1220455013 its reverse (3105540221), we get a palindrome (4325995234).

The spelling of 1220455013 in words is "one billion, two hundred twenty million, four hundred fifty-five thousand, thirteen".