1220555141 has 8 divisors (see below), whose sum is σ = 1315996920. Its totient is φ = 1125335232.

The previous prime is 1220555113. The next prime is 1220555207. The reversal of 1220555141 is 1415550221.

It can be written as a sum of positive squares in 4 ways, for example, as 450241 + 1220104900 = 671^2 + 34930^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1220555141 - 2²² = 1216360837 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1220555141.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220555111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43946 + ... + 66123.

It is an arithmetic number, because the mean of its divisors is an integer number (164499615).

Almost surely, 2^1220555141 is an apocalyptic number.

It is an amenable number.

1220555141 is a deficient number, since it is larger than the sum of its proper divisors (95441779).

1220555141 is a wasteful number, since it uses less digits than its factorization.

1220555141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110935.

The product of its (nonzero) digits is 2000, while the sum is 26.

The square root of 1220555141 is about 34936.4443096317. Note that the first 3 decimals coincide. The cubic root of 1220555141 is about 1068.6917778846.

The spelling of 1220555141 in words is "one billion, two hundred twenty million, five hundred fifty-five thousand, one hundred forty-one".