1220541313 has 4 divisors (see below), whose sum is σ = 1222875568. Its totient is φ = 1218207060.

The previous prime is 1220541281. The next prime is 1220541349. The reversal of 1220541313 is 3131450221.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 1220541313 - 2⁵ = 1220541281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1220541383) 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, 1166343 + ... + 1167388.

It is an arithmetic number, because the mean of its divisors is an integer number (305718892).

Almost surely, 2^1220541313 is an apocalyptic number.

It is an amenable number.

1220541313 is a deficient number, since it is larger than the sum of its proper divisors (2334255).

1220541313 is an equidigital number, since it uses as much as digits as its factorization.

1220541313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2334254.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 1220541313 is about 34936.2464068480. The cubic root of 1220541313 is about 1068.6877420364.

Adding to 1220541313 its reverse (3131450221), we get a palindrome (4351991534).

The spelling of 1220541313 in words is "one billion, two hundred twenty million, five hundred forty-one thousand, three hundred thirteen".