1220125155 has 16 divisors (see below), whose sum is σ = 1955681280. Its totient is φ = 649573088.

The previous prime is 1220125103. The next prime is 1220125171. The reversal of 1220125155 is 5515210221.

It is a cyclic number.

It is not a de Polignac number, because 1220125155 - 2⁹ = 1220124643 is a prime.

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, 63795 + ... + 80684.

It is an arithmetic number, because the mean of its divisors is an integer number (122230080).

Almost surely, 2^1220125155 is an apocalyptic number.

1220125155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1220125155 is a deficient number, since it is larger than the sum of its proper divisors (735556125).

1220125155 is a wasteful number, since it uses less digits than its factorization.

1220125155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145050.

The product of its (nonzero) digits is 1000, while the sum is 24.

The square root of 1220125155 is about 34930.2899358136. The cubic root of 1220125155 is about 1068.5662676531.

Adding to 1220125155 its reverse (5515210221), we get a palindrome (6735335376).

The spelling of 1220125155 in words is "one billion, two hundred twenty million, one hundred twenty-five thousand, one hundred fifty-five".