1200994561 has 8 divisors (see below), whose sum is σ = 1294453440. Its totient is φ = 1107689232.

The previous prime is 1200994547. The next prime is 1200994567. The reversal of 1200994561 is 1654990021.

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

It is not a de Polignac number, because 1200994561 - 2⁹ = 1200994049 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 1200994561.

It is not an unprimeable number, because it can be changed into a prime (1200994567) 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, 21871 + ... + 53668.

It is an arithmetic number, because the mean of its divisors is an integer number (161806680).

Almost surely, 2^1200994561 is an apocalyptic number.

It is an amenable number.

1200994561 is a deficient number, since it is larger than the sum of its proper divisors (93458879).

1200994561 is a wasteful number, since it uses less digits than its factorization.

1200994561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76775.

The product of its (nonzero) digits is 19440, while the sum is 37.

The square root of 1200994561 is about 34655.3684297253. The cubic root of 1200994561 is about 1062.9520655501.

The spelling of 1200994561 in words is "one billion, two hundred million, nine hundred ninety-four thousand, five hundred sixty-one".