129867661 has 8 divisors (see below), whose sum is σ = 161913024. Its totient is φ = 101195520.

The previous prime is 129867659. The next prime is 129867671. The reversal of 129867661 is 166768921.

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 129867661 - 2¹ = 129867659 is a prime.

It is a super-2 number, since 2×129867661² = 33731218747221842, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129867601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 843220 + ... + 843373.

It is an arithmetic number, because the mean of its divisors is an integer number (20239128).

Almost surely, 2^129867661 is an apocalyptic number.

129867661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

129867661 is a deficient number, since it is larger than the sum of its proper divisors (32045363).

129867661 is a wasteful number, since it uses less digits than its factorization.

129867661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1686611.

The product of its digits is 217728, while the sum is 46.

The square root of 129867661 is about 11395.9493242117. The cubic root of 129867661 is about 506.4077454668.

The spelling of 129867661 in words is "one hundred twenty-nine million, eight hundred sixty-seven thousand, six hundred sixty-one".