1280073561 has 16 divisors (see below), whose sum is σ = 1858711680. Its totient is φ = 778884480.

The previous prime is 1280073547. The next prime is 1280073569. The reversal of 1280073561 is 1653700821.

It is not a de Polignac number, because 1280073561 - 2⁷ = 1280073433 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1280073569) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 180925 + ... + 187866.

It is an arithmetic number, because the mean of its divisors is an integer number (116169480).

Almost surely, 2^1280073561 is an apocalyptic number.

It is an amenable number.

1280073561 is a deficient number, since it is larger than the sum of its proper divisors (578638119).

1280073561 is a wasteful number, since it uses less digits than its factorization.

1280073561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 368896.

The product of its (nonzero) digits is 10080, while the sum is 33.

The square root of 1280073561 is about 35778.1156714548. The cubic root of 1280073561 is about 1085.7878457473.

The spelling of 1280073561 in words is "one billion, two hundred eighty million, seventy-three thousand, five hundred sixty-one".