1201550056 has 16 divisors (see below), whose sum is σ = 2574750240. Its totient is φ = 514950000.

The previous prime is 1201550017. The next prime is 1201550057. The reversal of 1201550056 is 6500551021.

It is a self number, because there is not a number n which added to its sum of digits gives 1201550056.

It is not an unprimeable number, because it can be changed into a prime (1201550057) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10728070 + ... + 10728181.

It is an arithmetic number, because the mean of its divisors is an integer number (160921890).

Almost surely, 2^1201550056 is an apocalyptic number.

It is an amenable number.

1201550056 is an abundant number, since it is smaller than the sum of its proper divisors (1373200184).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1201550056 is a wasteful number, since it uses less digits than its factorization.

1201550056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21456264 (or 21456260 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 25.

The square root of 1201550056 is about 34663.3820623435. The cubic root of 1201550056 is about 1063.1159223969.

The spelling of 1201550056 in words is "one billion, two hundred one million, five hundred fifty thousand, fifty-six".