686731031949 has 8 divisors (see below), whose sum is σ = 915726682080. Its totient is φ = 457778034896.

The previous prime is 686731031947. The next prime is 686731031951. The reversal of 686731031949 is 949130137686.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (686731031947) and next prime (686731031951).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 686731031949 - 2¹ = 686731031947 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686731031947) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10625682 + ... + 10690115.

It is an arithmetic number, because the mean of its divisors is an integer number (114465835260).

Almost surely, 2^686731031949 is an apocalyptic number.

It is an amenable number.

686731031949 is a deficient number, since it is larger than the sum of its proper divisors (228995650131).

686731031949 is a wasteful number, since it uses less digits than its factorization.

686731031949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21326539.

The product of its (nonzero) digits is 5878656, while the sum is 57.

The spelling of 686731031949 in words is "six hundred eighty-six billion, seven hundred thirty-one million, thirty-one thousand, nine hundred forty-nine".