1220125156 has 48 divisors (see below), whose sum is σ = 2346624000. Its totient is φ = 552591360.

The previous prime is 1220125103. The next prime is 1220125171. The reversal of 1220125156 is 6515210221.

It is a self number, because there is not a number n which added to its sum of digits gives 1220125156.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 405345 + ... + 408343.

It is an arithmetic number, because the mean of its divisors is an integer number (48888000).

Almost surely, 2^1220125156 is an apocalyptic number.

It is an amenable number.

1220125156 is a deficient number, since it is larger than the sum of its proper divisors (1126498844).

1220125156 is a wasteful number, since it uses less digits than its factorization.

1220125156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3244 (or 3242 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 25.

The square root of 1220125156 is about 34930.2899501278. The cubic root of 1220125156 is about 1068.5662679451.

Adding to 1220125156 its reverse (6515210221), we get a palindrome (7735335377).

The spelling of 1220125156 in words is "one billion, two hundred twenty million, one hundred twenty-five thousand, one hundred fifty-six".