1220425513 has 4 divisors (see below), whose sum is σ = 1221811668. Its totient is φ = 1219039360.

The previous prime is 1220425511. The next prime is 1220425519. The reversal of 1220425513 is 3155240221.

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 455737104 + 764688409 = 21348^2 + 27653^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220425513 - 2¹ = 1220425511 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1220425511) 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, 691756 + ... + 693517.

It is an arithmetic number, because the mean of its divisors is an integer number (305452917).

Almost surely, 2^1220425513 is an apocalyptic number.

It is an amenable number.

1220425513 is a deficient number, since it is larger than the sum of its proper divisors (1386155).

1220425513 is an equidigital number, since it uses as much as digits as its factorization.

1220425513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1386154.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 1220425513 is about 34934.5890629903. The cubic root of 1220425513 is about 1068.6539433841.

Adding to 1220425513 its reverse (3155240221), we get a palindrome (4375665734).

The spelling of 1220425513 in words is "one billion, two hundred twenty million, four hundred twenty-five thousand, five hundred thirteen".