680906129 has 4 divisors (see below), whose sum is σ = 681118320. Its totient is φ = 680693940.

The previous prime is 680906119. The next prime is 680906179. The reversal of 680906129 is 921609086.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 680906129 - 2¹⁶ = 680840593 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (680906119) 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, 101207 + ... + 107724.

It is an arithmetic number, because the mean of its divisors is an integer number (170279580).

Almost surely, 2^680906129 is an apocalyptic number.

It is an amenable number.

680906129 is a deficient number, since it is larger than the sum of its proper divisors (212191).

680906129 is a wasteful number, since it uses less digits than its factorization.

680906129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212190.

The product of its (nonzero) digits is 46656, while the sum is 41.

The square root of 680906129 is about 26094.1780671475. The cubic root of 680906129 is about 879.7563586007.

The spelling of 680906129 in words is "six hundred eighty million, nine hundred six thousand, one hundred twenty-nine".