129906231 has 64 divisors (see below), whose sum is σ = 235726848. Its totient is φ = 61636608.

The previous prime is 129906229. The next prime is 129906247. The reversal of 129906231 is 132609921.

It is not a de Polignac number, because 129906231 - 2¹ = 129906229 is a prime.

It is a super-2 number, since 2×129906231² = 33751257705250722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 129906192 and 129906201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129906221) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 106135 + ... + 107351.

It is an arithmetic number, because the mean of its divisors is an integer number (3683232).

Almost surely, 2^129906231 is an apocalyptic number.

129906231 is a deficient number, since it is larger than the sum of its proper divisors (105820617).

129906231 is a wasteful number, since it uses less digits than its factorization.

129906231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1280.

The product of its (nonzero) digits is 5832, while the sum is 33.

The square root of 129906231 is about 11397.6414665491. The cubic root of 129906231 is about 506.4578739676.

The spelling of 129906231 in words is "one hundred twenty-nine million, nine hundred six thousand, two hundred thirty-one".