688265231 has 4 divisors (see below), whose sum is σ = 706867032. Its totient is φ = 669663432.

The previous prime is 688265189. The next prime is 688265233. The reversal of 688265231 is 132562886.

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 688265231 - 2¹⁸ = 688003087 is a prime.

It is a super-2 number, since 2×688265231² = 947418056406966722, 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 (688265233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9300845 + ... + 9300918.

It is an arithmetic number, because the mean of its divisors is an integer number (176716758).

Almost surely, 2^688265231 is an apocalyptic number.

688265231 is a deficient number, since it is larger than the sum of its proper divisors (18601801).

688265231 is a wasteful number, since it uses less digits than its factorization.

688265231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18601800.

The product of its digits is 138240, while the sum is 41.

The square root of 688265231 is about 26234.8095285634. The cubic root of 688265231 is about 882.9144208353.

The spelling of 688265231 in words is "six hundred eighty-eight million, two hundred sixty-five thousand, two hundred thirty-one".