688341531 has 4 divisors (see below), whose sum is σ = 917788712. Its totient is φ = 458894352.

The previous prime is 688341529. The next prime is 688341541. The reversal of 688341531 is 135143886.

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

It is not a de Polignac number, because 688341531 - 2¹ = 688341529 is a prime.

It is a super-2 number, since 2×688341531² = 947628126598847922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 688341531.

It is not an unprimeable number, because it can be changed into a prime (688341541) 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, 114723586 + ... + 114723591.

It is an arithmetic number, because the mean of its divisors is an integer number (229447178).

Almost surely, 2^688341531 is an apocalyptic number.

688341531 is a deficient number, since it is larger than the sum of its proper divisors (229447181).

688341531 is a wasteful number, since it uses less digits than its factorization.

688341531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229447180.

The product of its digits is 69120, while the sum is 39.

The square root of 688341531 is about 26236.2636631057. The cubic root of 688341531 is about 882.9470457973.

The spelling of 688341531 in words is "six hundred eighty-eight million, three hundred forty-one thousand, five hundred thirty-one".