1200555361 has 4 divisors (see below), whose sum is σ = 1200809412. Its totient is φ = 1200301312.

The previous prime is 1200555353. The next prime is 1200555373. The reversal of 1200555361 is 1635550021.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 180391761 + 1020163600 = 13431^2 + 31940^2 .

It is a cyclic number.

It is not a de Polignac number, because 1200555361 - 2³ = 1200555353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1200555341) 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, 119800 + ... + 129433.

It is an arithmetic number, because the mean of its divisors is an integer number (300202353).

Almost surely, 2^1200555361 is an apocalyptic number.

It is an amenable number.

1200555361 is a deficient number, since it is larger than the sum of its proper divisors (254051).

1200555361 is an equidigital number, since it uses as much as digits as its factorization.

1200555361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254050.

The product of its (nonzero) digits is 4500, while the sum is 28.

The square root of 1200555361 is about 34649.0311697167. The cubic root of 1200555361 is about 1062.8224769901.

The spelling of 1200555361 in words is "one billion, two hundred million, five hundred fifty-five thousand, three hundred sixty-one".