1220625188 has 6 divisors (see below), whose sum is σ = 2136094086. Its totient is φ = 610312592.

The previous prime is 1220625179. The next prime is 1220625191. The reversal of 1220625188 is 8815260221.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1005650944 + 214974244 = 31712^2 + 14662^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 152578145 + ... + 152578152.

It is an arithmetic number, because the mean of its divisors is an integer number (356015681).

Almost surely, 2^1220625188 is an apocalyptic number.

It is an amenable number.

1220625188 is a deficient number, since it is larger than the sum of its proper divisors (915468898).

1220625188 is a wasteful number, since it uses less digits than its factorization.

1220625188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305156301 (or 305156299 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 35.

The square root of 1220625188 is about 34937.4467870793. The cubic root of 1220625188 is about 1068.7122213747.

The spelling of 1220625188 in words is "one billion, two hundred twenty million, six hundred twenty-five thousand, one hundred eighty-eight".