129971086 has 16 divisors (see below), whose sum is σ = 235914336. Its totient is φ = 52425216.

The previous prime is 129971071. The next prime is 129971087. The reversal of 129971086 is 680179921.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129971087) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 272811 + ... + 273286.

It is an arithmetic number, because the mean of its divisors is an integer number (14744646).

Almost surely, 2^129971086 is an apocalyptic number.

129971086 is a deficient number, since it is larger than the sum of its proper divisors (105943250).

129971086 is a wasteful number, since it uses less digits than its factorization.

129971086 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 546123.

The product of its (nonzero) digits is 54432, while the sum is 43.

The square root of 129971086 is about 11400.4862177014. The cubic root of 129971086 is about 506.5421420856.

The spelling of 129971086 in words is "one hundred twenty-nine million, nine hundred seventy-one thousand, eighty-six".