686070121 has 12 divisors (see below), whose sum is σ = 760798836. Its totient is φ = 618168320.

The previous prime is 686070109. The next prime is 686070149. The reversal of 686070121 is 121070686.

It can be written as a sum of positive squares in 2 ways, for example, as 385533225 + 300536896 = 19635^2 + 17336^2 .

It is not a de Polignac number, because 686070121 - 2⁹ = 686069609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (686070191) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11416 + ... + 38761.

It is an arithmetic number, because the mean of its divisors is an integer number (63399903).

Almost surely, 2^686070121 is an apocalyptic number.

It is an amenable number.

686070121 is a deficient number, since it is larger than the sum of its proper divisors (74728715).

686070121 is a wasteful number, since it uses less digits than its factorization.

686070121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50312 (or 50301 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 686070121 is about 26192.9402893222. The cubic root of 686070121 is about 881.9747838767.

The spelling of 686070121 in words is "six hundred eighty-six million, seventy thousand, one hundred twenty-one".