129236081 has 16 divisors (see below), whose sum is σ = 147315840. Its totient is φ = 112389120.

The previous prime is 129236077. The next prime is 129236131. The reversal of 129236081 is 180632921.

It is a cyclic number.

It is not a de Polignac number, because 129236081 - 2² = 129236077 is a prime.

It is a super-2 number, since 2×129236081² = 33403929264477122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129236071) 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, 46316 + ... + 49026.

It is an arithmetic number, because the mean of its divisors is an integer number (9207240).

Almost surely, 2^129236081 is an apocalyptic number.

It is an amenable number.

129236081 is a deficient number, since it is larger than the sum of its proper divisors (18079759).

129236081 is a wasteful number, since it uses less digits than its factorization.

129236081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2936.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 129236081 is about 11368.2048275003. The cubic root of 129236081 is about 505.5854804776.

It can be divided in two parts, 1292 and 36081, that added together give a palindrome (37373).

The spelling of 129236081 in words is "one hundred twenty-nine million, two hundred thirty-six thousand, eighty-one".