1283555521 has 2 divisors, whose sum is σ = 1283555522. Its totient is φ = 1283555520.

The previous prime is 1283555519. The next prime is 1283555543. The reversal of 1283555521 is 1255553821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1222481296 + 61074225 = 34964^2 + 7815^2 .

It is an emirp because it is prime and its reverse (1255553821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1283555521 - 2¹ = 1283555519 is a prime.

Together with 1283555519, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1283559521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 641777760 + 641777761.

It is an arithmetic number, because the mean of its divisors is an integer number (641777761).

Almost surely, 2^1283555521 is an apocalyptic number.

It is an amenable number.

1283555521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1283555521 is an equidigital number, since it uses as much as digits as its factorization.

1283555521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60000, while the sum is 37.

The square root of 1283555521 is about 35826.7430978592. The cubic root of 1283555521 is about 1086.7714473070.

The spelling of 1283555521 in words is "one billion, two hundred eighty-three million, five hundred fifty-five thousand, five hundred twenty-one".