1220107156 has 12 divisors (see below), whose sum is σ = 2137148692. Its totient is φ = 609493248.

The previous prime is 1220107099. The next prime is 1220107159. The reversal of 1220107156 is 6517010221.

It can be written as a sum of positive squares in 2 ways, for example, as 1209648400 + 10458756 = 34780^2 + 3234^2 .

It is a super-2 number, since 2×1220107156² = 2977322944244816672, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1220107156.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220107159) 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, 135165 + ... + 143908.

Almost surely, 2^1220107156 is an apocalyptic number.

It is an amenable number.

1220107156 is a deficient number, since it is larger than the sum of its proper divisors (917041536).

1220107156 is a wasteful number, since it uses less digits than its factorization.

1220107156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280170 (or 280168 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 25.

The square root of 1220107156 is about 34930.0322931428. The cubic root of 1220107156 is about 1068.5610132144.

Adding to 1220107156 its reverse (6517010221), we get a palindrome (7737117377).

The spelling of 1220107156 in words is "one billion, two hundred twenty million, one hundred seven thousand, one hundred fifty-six".