1247136487 has 2 divisors, whose sum is σ = 1247136488. Its totient is φ = 1247136486.

The previous prime is 1247136433. The next prime is 1247136509. The reversal of 1247136487 is 7846317421.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1247136487 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1247136287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 623568243 + 623568244.

It is an arithmetic number, because the mean of its divisors is an integer number (623568244).

Almost surely, 2^1247136487 is an apocalyptic number.

1247136487 is a deficient number, since it is larger than the sum of its proper divisors (1).

1247136487 is an equidigital number, since it uses as much as digits as its factorization.

1247136487 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 225792, while the sum is 43.

The square root of 1247136487 is about 35314.8196512456. The cubic root of 1247136487 is about 1076.3941492014.

The spelling of 1247136487 in words is "one billion, two hundred forty-seven million, one hundred thirty-six thousand, four hundred eighty-seven".