1247102561 has 8 divisors (see below), whose sum is σ = 1275370920. Its totient is φ = 1219009792.

The previous prime is 1247102551. The next prime is 1247102567. The reversal of 1247102561 is 1652017421.

It can be written as a sum of positive squares in 4 ways, for example, as 263088400 + 984014161 = 16220^2 + 31369^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1247102561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1247102567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29480 + ... + 57993.

It is an arithmetic number, because the mean of its divisors is an integer number (159421365).

Almost surely, 2^1247102561 is an apocalyptic number.

It is an amenable number.

1247102561 is a deficient number, since it is larger than the sum of its proper divisors (28268359).

1247102561 is an equidigital number, since it uses as much as digits as its factorization.

1247102561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87795.

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 1247102561 is about 35314.3393113902. The cubic root of 1247102561 is about 1076.3843886875.

Adding to 1247102561 its reverse (1652017421), we get a palindrome (2899119982).

The spelling of 1247102561 in words is "one billion, two hundred forty-seven million, one hundred two thousand, five hundred sixty-one".