686252369 has 4 divisors (see below), whose sum is σ = 748638960. Its totient is φ = 623865780.

The previous prime is 686252339. The next prime is 686252387. The reversal of 686252369 is 963252686.

686252369 = 3192² + 3193² + ... + 3257².

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-686252369 is a prime.

It is a super-2 number, since 2×686252369² = 941884627916224322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (686252339) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31193279 + ... + 31193300.

It is an arithmetic number, because the mean of its divisors is an integer number (187159740).

Almost surely, 2^686252369 is an apocalyptic number.

It is an amenable number.

686252369 is a deficient number, since it is larger than the sum of its proper divisors (62386591).

686252369 is a wasteful number, since it uses less digits than its factorization.

686252369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62386590.

The product of its digits is 933120, while the sum is 47.

The square root of 686252369 is about 26196.4190110022. The cubic root of 686252369 is about 882.0528730325.

The spelling of 686252369 in words is "six hundred eighty-six million, two hundred fifty-two thousand, three hundred sixty-nine".