686106154 has 4 divisors (see below), whose sum is σ = 1029159234. Its totient is φ = 343053076.

The previous prime is 686106067. The next prime is 686106191. The reversal of 686106154 is 451601686.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 607376025 + 78730129 = 24645^2 + 8873^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 171526537 + ... + 171526540.

Almost surely, 2^686106154 is an apocalyptic number.

686106154 is a deficient number, since it is larger than the sum of its proper divisors (343053080).

686106154 is a wasteful number, since it uses less digits than its factorization.

686106154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 343053079.

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 686106154 is about 26193.6281183039. The cubic root of 686106154 is about 881.9902243009.

The spelling of 686106154 in words is "six hundred eighty-six million, one hundred six thousand, one hundred fifty-four".