687572121 has 8 divisors (see below), whose sum is σ = 921828544. Its totient is φ = 455848560.

The previous prime is 687572099. The next prime is 687572153. The reversal of 687572121 is 121275786.

687572121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 687572121 - 2⁷ = 687571993 is a prime.

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 687572121.

It is not an unprimeable number, because it can be changed into a prime (687572321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 632581 + ... + 633666.

It is an arithmetic number, because the mean of its divisors is an integer number (115228568).

Almost surely, 2^687572121 is an apocalyptic number.

It is an amenable number.

687572121 is a deficient number, since it is larger than the sum of its proper divisors (234256423).

687572121 is a wasteful number, since it uses less digits than its factorization.

687572121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1266431.

The product of its digits is 47040, while the sum is 39.

The square root of 687572121 is about 26221.5964616955. The cubic root of 687572121 is about 882.6179448436.

The spelling of 687572121 in words is "six hundred eighty-seven million, five hundred seventy-two thousand, one hundred twenty-one".