129698669 has 4 divisors (see below), whose sum is σ = 129722460. Its totient is φ = 129674880.

The previous prime is 129698663. The next prime is 129698671. The reversal of 129698669 is 966896921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 966896921 = 761 ⋅1270561.

It can be written as a sum of positive squares in 2 ways, for example, as 57957769 + 71740900 = 7613^2 + 8470^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129698669 is a prime.

It is a super-2 number, since 2×129698669² = 33643489480743122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129698663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 797 + ... + 16125.

It is an arithmetic number, because the mean of its divisors is an integer number (32430615).

Almost surely, 2^129698669 is an apocalyptic number.

It is an amenable number.

129698669 is a deficient number, since it is larger than the sum of its proper divisors (23791).

129698669 is an equidigital number, since it uses as much as digits as its factorization.

129698669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23790.

The product of its digits is 2519424, while the sum is 56.

The square root of 129698669 is about 11388.5323461805. The cubic root of 129698669 is about 506.1879935437.

The spelling of 129698669 in words is "one hundred twenty-nine million, six hundred ninety-eight thousand, six hundred sixty-nine".