686026149 has 4 divisors (see below), whose sum is σ = 914701536. Its totient is φ = 457350764.

The previous prime is 686026123. The next prime is 686026157. The reversal of 686026149 is 941620686.

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 not a de Polignac number, because 686026149 - 2¹⁵ = 685993381 is a prime.

It is a super-2 number, since 2×686026149² = 941263754223540402, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 686026149.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686026849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 114337689 + ... + 114337694.

It is an arithmetic number, because the mean of its divisors is an integer number (228675384).

Almost surely, 2^686026149 is an apocalyptic number.

It is an amenable number.

686026149 is a deficient number, since it is larger than the sum of its proper divisors (228675387).

686026149 is a wasteful number, since it uses less digits than its factorization.

686026149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228675386.

The product of its (nonzero) digits is 124416, while the sum is 42.

The square root of 686026149 is about 26192.1008893903. The cubic root of 686026149 is about 881.9559407961.

The spelling of 686026149 in words is "six hundred eighty-six million, twenty-six thousand, one hundred forty-nine".