1283860561 has 3 divisors (see below), whose sum is σ = 1283896393. Its totient is φ = 1283824730.

The previous prime is 1283860549. The next prime is 1283860577. The reversal of 1283860561 is 1650683821.

The square root of 1283860561 is 35831.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 1283860561 - 2⁷ = 1283860433 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1283860531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 17916 + ... + 53746.

Almost surely, 2^1283860561 is an apocalyptic number.

1283860561 is the 35831-st square number.

1283860561 is the 17916-th centered octagonal number.

It is an amenable number.

1283860561 is a deficient number, since it is larger than the sum of its proper divisors (35832).

1283860561 is an frugal number, since it uses more digits than its factorization.

1283860561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71662 (or 35831 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 40.

The cubic root of 1283860561 is about 1086.8575317547.

The spelling of 1283860561 in words is "one billion, two hundred eighty-three million, eight hundred sixty thousand, five hundred sixty-one".