1261513006 has 16 divisors (see below), whose sum is σ = 2049894000. Its totient is φ = 582234744.

The previous prime is 1261512991. The next prime is 1261513013. The reversal of 1261513006 is 6003151621.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 139156 + ... + 147943.

It is an arithmetic number, because the mean of its divisors is an integer number (128118375).

Almost surely, 2^1261513006 is an apocalyptic number.

1261513006 is a deficient number, since it is larger than the sum of its proper divisors (788380994).

1261513006 is an equidigital number, since it uses as much as digits as its factorization.

1261513006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287140 (or 287114 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 1261513006 is about 35517.7843622037. The cubic root of 1261513006 is about 1080.5144456972.

Adding to 1261513006 its reverse (6003151621), we get a palindrome (7264664627).

The spelling of 1261513006 in words is "one billion, two hundred sixty-one million, five hundred thirteen thousand, six".