1306620681 has 4 divisors (see below), whose sum is σ = 1742160912. Its totient is φ = 871080452.

The previous prime is 1306620647. The next prime is 1306620683. The reversal of 1306620681 is 1860266031.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1306620681 - 2¹¹ = 1306618633 is a prime.

It is a super-2 number, since 2×1306620681² = 3414515208033807522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1306620683) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 217770111 + ... + 217770116.

It is an arithmetic number, because the mean of its divisors is an integer number (435540228).

Almost surely, 2^1306620681 is an apocalyptic number.

It is an amenable number.

1306620681 is a deficient number, since it is larger than the sum of its proper divisors (435540231).

1306620681 is an equidigital number, since it uses as much as digits as its factorization.

1306620681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 435540230.

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 1306620681 is about 36147.2084814305. The cubic root of 1306620681 is about 1093.2425066971.

The spelling of 1306620681 in words is "one billion, three hundred six million, six hundred twenty thousand, six hundred eighty-one".