1220245331 has 4 divisors (see below), whose sum is σ = 1225351200. Its totient is φ = 1215139464.

The previous prime is 1220245307. The next prime is 1220245361. The reversal of 1220245331 is 1335420221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1335420221 = 307 ⋅4349903.

It is a cyclic number.

It is not a de Polignac number, because 1220245331 - 2¹⁰ = 1220244307 is a prime.

It is a super-2 number, since 2×1220245331² = 2977997335654599122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1220245297 and 1220245306.

It is not an unprimeable number, because it can be changed into a prime (1220245361) 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, 2552576 + ... + 2553053.

It is an arithmetic number, because the mean of its divisors is an integer number (306337800).

Almost surely, 2^1220245331 is an apocalyptic number.

1220245331 is a deficient number, since it is larger than the sum of its proper divisors (5105869).

1220245331 is an equidigital number, since it uses as much as digits as its factorization.

1220245331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5105868.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 1220245331 is about 34932.0101196596. The cubic root of 1220245331 is about 1068.6013492466.

Adding to 1220245331 its reverse (1335420221), we get a palindrome (2555665552).

The spelling of 1220245331 in words is "one billion, two hundred twenty million, two hundred forty-five thousand, three hundred thirty-one".