1301639865 has 16 divisors (see below), whose sum is σ = 2084548608. Its totient is φ = 693566336.

The previous prime is 1301639837. The next prime is 1301639903. The reversal of 1301639865 is 5689361031.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1301639865 - 2¹⁰ = 1301638841 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23097 + ... + 56006.

It is an arithmetic number, because the mean of its divisors is an integer number (130284288).

Almost surely, 2^1301639865 is an apocalyptic number.

1301639865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1301639865 is a deficient number, since it is larger than the sum of its proper divisors (782908743).

1301639865 is a wasteful number, since it uses less digits than its factorization.

1301639865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80208.

The product of its (nonzero) digits is 116640, while the sum is 42.

The square root of 1301639865 is about 36078.2464235722. The cubic root of 1301639865 is about 1091.8515971564.

The spelling of 1301639865 in words is "one billion, three hundred one million, six hundred thirty-nine thousand, eight hundred sixty-five".