1306285981 has 16 divisors (see below), whose sum is σ = 1753895808. Its totient is φ = 939585600.

The previous prime is 1306285979. The next prime is 1306285987. The reversal of 1306285981 is 1895826031.

It is a cyclic number.

It is not a de Polignac number, because 1306285981 - 2¹ = 1306285979 is a prime.

It is a super-2 number, since 2×1306285981² = 3412766128314264722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1306285987) 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, 651490 + ... + 653491.

It is an arithmetic number, because the mean of its divisors is an integer number (109618488).

Almost surely, 2^1306285981 is an apocalyptic number.

1306285981 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1306285981 is a deficient number, since it is larger than the sum of its proper divisors (447609827).

1306285981 is a wasteful number, since it uses less digits than its factorization.

1306285981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1305012.

The product of its (nonzero) digits is 103680, while the sum is 43.

The square root of 1306285981 is about 36142.5785051371. The cubic root of 1306285981 is about 1093.1491514946.

The spelling of 1306285981 in words is "one billion, three hundred six million, two hundred eighty-five thousand, nine hundred eighty-one".