1220425155 has 24 divisors (see below), whose sum is σ = 2239840512. Its totient is φ = 612605184.

The previous prime is 1220425153. The next prime is 1220425163. The reversal of 1220425155 is 5515240221.

1220425155 is a `hidden beast` number, since 1 + 220 + 425 + 15 + 5 = 666.

It is not a de Polignac number, because 1220425155 - 2¹ = 1220425153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1220425153) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 796899 + ... + 798428.

It is an arithmetic number, because the mean of its divisors is an integer number (93326688).

Almost surely, 2^1220425155 is an apocalyptic number.

1220425155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1220425155 is a deficient number, since it is larger than the sum of its proper divisors (1019415357).

1220425155 is a wasteful number, since it uses less digits than its factorization.

1220425155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1595355 (or 1595352 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 27.

The square root of 1220425155 is about 34934.5839391283. The cubic root of 1220425155 is about 1068.6538388910.

Adding to 1220425155 its reverse (5515240221), we get a palindrome (6735665376).

The spelling of 1220425155 in words is "one billion, two hundred twenty million, four hundred twenty-five thousand, one hundred fifty-five".