1284728537 has 2 divisors, whose sum is σ = 1284728538. Its totient is φ = 1284728536.

The previous prime is 1284728521. The next prime is 1284728569. The reversal of 1284728537 is 7358274821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1078202896 + 206525641 = 32836^2 + 14371^2 .

It is an emirp because it is prime and its reverse (7358274821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1284728537 - 2⁴ = 1284728521 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1284728491 and 1284728500.

It is not a weakly prime, because it can be changed into another prime (1284758537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 642364268 + 642364269.

It is an arithmetic number, because the mean of its divisors is an integer number (642364269).

Almost surely, 2^1284728537 is an apocalyptic number.

It is an amenable number.

1284728537 is a deficient number, since it is larger than the sum of its proper divisors (1).

1284728537 is an equidigital number, since it uses as much as digits as its factorization.

1284728537 is an evil number, because the sum of its binary digits is even.

The product of its digits is 752640, while the sum is 47.

The square root of 1284728537 is about 35843.1100352634. The cubic root of 1284728537 is about 1087.1024061511.

The spelling of 1284728537 in words is "one billion, two hundred eighty-four million, seven hundred twenty-eight thousand, five hundred thirty-seven".