1306981689 has 16 divisors (see below), whose sum is σ = 1920338112. Its totient is φ = 785590848.

The previous prime is 1306981681. The next prime is 1306981691. The reversal of 1306981689 is 9861896031.

It is not a de Polignac number, because 1306981689 - 2³ = 1306981681 is a prime.

It is a super-2 number, since 2×1306981689² = 3416402270762585442, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1306981681) 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 in 15 ways as a sum of consecutive naturals, for example, 388002 + ... + 391355.

It is an arithmetic number, because the mean of its divisors is an integer number (120021132).

Almost surely, 2^1306981689 is an apocalyptic number.

It is an amenable number.

1306981689 is a deficient number, since it is larger than the sum of its proper divisors (613356423).

1306981689 is a wasteful number, since it uses less digits than its factorization.

1306981689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 779416.

The product of its (nonzero) digits is 559872, while the sum is 51.

The square root of 1306981689 is about 36152.2017171845. The cubic root of 1306981689 is about 1093.3431819107.

The spelling of 1306981689 in words is "one billion, three hundred six million, nine hundred eighty-one thousand, six hundred eighty-nine".