129630681 has 12 divisors (see below), whose sum is σ = 191599408. Its totient is φ = 84410424.

The previous prime is 129630679. The next prime is 129630689. The reversal of 129630681 is 186036921.

129630681 is a `hidden beast` number, since 12 + 9 + 630 + 6 + 8 + 1 = 666.

It is not a de Polignac number, because 129630681 - 2¹ = 129630679 is a prime.

It is a super-3 number, since 3×129630681³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129630689) 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, 167095 + ... + 167868.

Almost surely, 2^129630681 is an apocalyptic number.

It is an amenable number.

129630681 is a deficient number, since it is larger than the sum of its proper divisors (61968727).

129630681 is a wasteful number, since it uses less digits than its factorization.

129630681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335012 (or 335009 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 129630681 is about 11385.5470224316. The cubic root of 129630681 is about 506.0995302240.

The spelling of 129630681 in words is "one hundred twenty-nine million, six hundred thirty thousand, six hundred eighty-one".