1287631337 has 2 divisors, whose sum is σ = 1287631338. Its totient is φ = 1287631336.

The previous prime is 1287631313. The next prime is 1287631361. The reversal of 1287631337 is 7331367821.

It is a balanced prime because it is at equal distance from previous prime (1287631313) and next prime (1287631361).

It can be written as a sum of positive squares in only one way, i.e., 1116963241 + 170668096 = 33421^2 + 13064^2 .

It is a cyclic number.

It is not a de Polignac number, because 1287631337 - 2²⁶ = 1220522473 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1287631294 and 1287631303.

It is not a weakly prime, because it can be changed into another prime (1287631307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 643815668 + 643815669.

It is an arithmetic number, because the mean of its divisors is an integer number (643815669).

Almost surely, 2^1287631337 is an apocalyptic number.

It is an amenable number.

1287631337 is a deficient number, since it is larger than the sum of its proper divisors (1).

1287631337 is an equidigital number, since it uses as much as digits as its factorization.

1287631337 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 127008, while the sum is 41.

The square root of 1287631337 is about 35883.5803258259. The cubic root of 1287631337 is about 1087.9205471216.

The spelling of 1287631337 in words is "one billion, two hundred eighty-seven million, six hundred thirty-one thousand, three hundred thirty-seven".