688347121 has 16 divisors (see below), whose sum is σ = 858774528. Its totient is φ = 536014800.

The previous prime is 688347097. The next prime is 688347131. The reversal of 688347121 is 121743886.

It is a cyclic number.

It is not a de Polignac number, because 688347121 - 2⁷ = 688346993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (688347131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 213306 + ... + 216508.

It is an arithmetic number, because the mean of its divisors is an integer number (53673408).

Almost surely, 2^688347121 is an apocalyptic number.

It is an amenable number.

688347121 is a deficient number, since it is larger than the sum of its proper divisors (170427407).

688347121 is a wasteful number, since it uses less digits than its factorization.

688347121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6012.

The product of its digits is 64512, while the sum is 40.

The square root of 688347121 is about 26236.3701948269. The cubic root of 688347121 is about 882.9494359193.

The spelling of 688347121 in words is "six hundred eighty-eight million, three hundred forty-seven thousand, one hundred twenty-one".