686522149 has 8 divisors (see below), whose sum is σ = 702824472. Its totient is φ = 670406400.

The previous prime is 686522143. The next prime is 686522153. The reversal of 686522149 is 941225686.

It can be written as a sum of positive squares in 4 ways, for example, as 271096225 + 415425924 = 16465^2 + 20382^2 .

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 686522149 - 2¹⁹ = 685997861 is a prime.

It is a super-2 number, since 2×686522149² = 942625322135156402, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686522143) 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, 39184 + ... + 53929.

It is an arithmetic number, because the mean of its divisors is an integer number (87853059).

Almost surely, 2^686522149 is an apocalyptic number.

It is an amenable number.

686522149 is a deficient number, since it is larger than the sum of its proper divisors (16302323).

686522149 is a wasteful number, since it uses less digits than its factorization.

686522149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93287.

The product of its digits is 207360, while the sum is 43.

The square root of 686522149 is about 26201.5676821064. The cubic root of 686522149 is about 882.1684422989.

The spelling of 686522149 in words is "six hundred eighty-six million, five hundred twenty-two thousand, one hundred forty-nine".