687195231 has 4 divisors (see below), whose sum is σ = 916260312. Its totient is φ = 458130152.

The previous prime is 687195227. The next prime is 687195251. The reversal of 687195231 is 132591786.

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

It is a cyclic number.

It is not a de Polignac number, because 687195231 - 2² = 687195227 is a prime.

It is a super-2 number, since 2×687195231² = 944474571018286722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687195251) 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, 114532536 + ... + 114532541.

It is an arithmetic number, because the mean of its divisors is an integer number (229065078).

Almost surely, 2^687195231 is an apocalyptic number.

687195231 is a deficient number, since it is larger than the sum of its proper divisors (229065081).

687195231 is a wasteful number, since it uses less digits than its factorization.

687195231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229065080.

The product of its digits is 90720, while the sum is 42.

The square root of 687195231 is about 26214.4088432297. The cubic root of 687195231 is about 882.4566474971.

The spelling of 687195231 in words is "six hundred eighty-seven million, one hundred ninety-five thousand, two hundred thirty-one".