686711137 has 6 divisors (see below), whose sum is σ = 798827298. Its totient is φ = 588609504.

The previous prime is 686711117. The next prime is 686711143. The reversal of 686711137 is 731117686.

It can be written as a sum of positive squares in only one way, i.e., 401641681 + 285069456 = 20041^2 + 16884^2 .

It is not a de Polignac number, because 686711137 - 2²³ = 678322529 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 686711137.

It is not an unprimeable number, because it can be changed into a prime (686711117) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7007208 + ... + 7007305.

It is an arithmetic number, because the mean of its divisors is an integer number (133137883).

Almost surely, 2^686711137 is an apocalyptic number.

It is an amenable number.

686711137 is a deficient number, since it is larger than the sum of its proper divisors (112116161).

686711137 is a wasteful number, since it uses less digits than its factorization.

686711137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14014527 (or 14014520 counting only the distinct ones).

The product of its digits is 42336, while the sum is 40.

The square root of 686711137 is about 26205.1738593736. The cubic root of 686711137 is about 882.2493835833.

The spelling of 686711137 in words is "six hundred eighty-six million, seven hundred eleven thousand, one hundred thirty-seven".