686150231 has 4 divisors (see below), whose sum is σ = 738931032. Its totient is φ = 633369432.

The previous prime is 686150203. The next prime is 686150239. The reversal of 686150231 is 132051686.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-686150231 is a prime.

It is a super-2 number, since 2×686150231² = 941604279002706722, 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 (686150239) 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, 26390381 + ... + 26390406.

It is an arithmetic number, because the mean of its divisors is an integer number (184732758).

Almost surely, 2^686150231 is an apocalyptic number.

686150231 is a deficient number, since it is larger than the sum of its proper divisors (52780801).

686150231 is a wasteful number, since it uses less digits than its factorization.

686150231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52780800.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 686150231 is about 26194.4694735358. The cubic root of 686150231 is about 882.0091109073.

The spelling of 686150231 in words is "six hundred eighty-six million, one hundred fifty thousand, two hundred thirty-one".