1283979561 has 8 divisors (see below), whose sum is σ = 1727679360. Its totient is φ = 848133072.

The previous prime is 1283979559. The next prime is 1283979581. The reversal of 1283979561 is 1659793821.

1283979561 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 1283979561 - 2¹ = 1283979559 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1283979551) 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, 1962945 + ... + 1963598.

It is an arithmetic number, because the mean of its divisors is an integer number (215959920).

Almost surely, 2^1283979561 is an apocalyptic number.

It is an amenable number.

1283979561 is a deficient number, since it is larger than the sum of its proper divisors (443699799).

1283979561 is a wasteful number, since it uses less digits than its factorization.

1283979561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3926655.

The product of its digits is 816480, while the sum is 51.

The square root of 1283979561 is about 35832.6605347691. The cubic root of 1283979561 is about 1086.8911107000.

The spelling of 1283979561 in words is "one billion, two hundred eighty-three million, nine hundred seventy-nine thousand, five hundred sixty-one".