129942101 has 8 divisors (see below), whose sum is σ = 137865240. Its totient is φ = 122050048.

The previous prime is 129942097. The next prime is 129942107. The reversal of 129942101 is 101249921.

It can be written as a sum of positive squares in 4 ways, for example, as 44823025 + 85119076 = 6695^2 + 9226^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 129942101 - 2² = 129942097 is a prime.

It is a super-2 number, since 2×129942101² = 33769899224588402, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129942107) 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, 1145 + ... + 16161.

It is an arithmetic number, because the mean of its divisors is an integer number (17233155).

Almost surely, 2^129942101 is an apocalyptic number.

It is an amenable number.

129942101 is a deficient number, since it is larger than the sum of its proper divisors (7923139).

129942101 is a wasteful number, since it uses less digits than its factorization.

129942101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15543.

The product of its (nonzero) digits is 1296, while the sum is 29.

The square root of 129942101 is about 11399.2149291081. The cubic root of 129942101 is about 506.5044844393.

The spelling of 129942101 in words is "one hundred twenty-nine million, nine hundred forty-two thousand, one hundred one".