1316781639 has 6 divisors (see below), whose sum is σ = 1902017936. Its totient is φ = 877854420.

The previous prime is 1316781589. The next prime is 1316781649. The reversal of 1316781639 is 9361876131.

1316781639 is a `hidden beast` number, since 1 + 3 + 1 + 6 + 7 + 8 + 1 + 639 = 666.

It is not a de Polignac number, because 1316781639 - 2⁸ = 1316781383 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1316781594 and 1316781603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1316781649) 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 5 ways as a sum of consecutive naturals, for example, 73154527 + ... + 73154544.

Almost surely, 2^1316781639 is an apocalyptic number.

1316781639 is a deficient number, since it is larger than the sum of its proper divisors (585236297).

1316781639 is a wasteful number, since it uses less digits than its factorization.

1316781639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146309077 (or 146309074 counting only the distinct ones).

The product of its digits is 163296, while the sum is 45.

The square root of 1316781639 is about 36287.4859834627. The cubic root of 1316781639 is about 1096.0690653793.

The spelling of 1316781639 in words is "one billion, three hundred sixteen million, seven hundred eighty-one thousand, six hundred thirty-nine".