1287242897 has 2 divisors, whose sum is σ = 1287242898. Its totient is φ = 1287242896.

The previous prime is 1287242857. The next prime is 1287242899. The reversal of 1287242897 is 7982427821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1284433921 + 2808976 = 35839^2 + 1676^2 .

It is a cyclic number.

It is not a de Polignac number, because 1287242897 - 2¹⁴ = 1287226513 is a prime.

Together with 1287242899, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1287242899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 643621448 + 643621449.

It is an arithmetic number, because the mean of its divisors is an integer number (643621449).

Almost surely, 2^1287242897 is an apocalyptic number.

It is an amenable number.

1287242897 is a deficient number, since it is larger than the sum of its proper divisors (1).

1287242897 is an equidigital number, since it uses as much as digits as its factorization.

1287242897 is an evil number, because the sum of its binary digits is even.

The product of its digits is 903168, while the sum is 50.

The square root of 1287242897 is about 35878.1674141810. The cubic root of 1287242897 is about 1087.8111383835.

The spelling of 1287242897 in words is "one billion, two hundred eighty-seven million, two hundred forty-two thousand, eight hundred ninety-seven".