646713137 has 16 divisors (see below), whose sum is σ = 767817600. Its totient is φ = 532949760.

The previous prime is 646713113. The next prime is 646713139. The reversal of 646713137 is 731317646.

It is not a de Polignac number, because 646713137 - 2⁶ = 646713073 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 646713137.

It is not an unprimeable number, because it can be changed into a prime (646713139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42314 + ... + 55532.

It is an arithmetic number, because the mean of its divisors is an integer number (47988600).

Almost surely, 2^646713137 is an apocalyptic number.

It is an amenable number.

646713137 is a deficient number, since it is larger than the sum of its proper divisors (121104463).

646713137 is a wasteful number, since it uses less digits than its factorization.

646713137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13496.

The product of its digits is 63504, while the sum is 38.

The square root of 646713137 is about 25430.5551846593. Note that the first 3 decimals coincide. The cubic root of 646713137 is about 864.7765299742.

The spelling of 646713137 in words is "six hundred forty-six million, seven hundred thirteen thousand, one hundred thirty-seven".