129735899 has 4 divisors (see below), whose sum is σ = 133920960. Its totient is φ = 125550840.

The previous prime is 129735887. The next prime is 129735911. The reversal of 129735899 is 998537921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 998537921 = 313 ⋅3190217.

It is an interprime number because it is at equal distance from previous prime (129735887) and next prime (129735911).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129735899 is a prime.

It is a super-3 number, since 3×129735899³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 129735899.

It is not an unprimeable number, because it can be changed into a prime (129735829) 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 3 ways as a sum of consecutive naturals, for example, 2092484 + ... + 2092545.

It is an arithmetic number, because the mean of its divisors is an integer number (33480240).

Almost surely, 2^129735899 is an apocalyptic number.

129735899 is a deficient number, since it is larger than the sum of its proper divisors (4185061).

129735899 is an equidigital number, since it uses as much as digits as its factorization.

129735899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4185060.

The product of its digits is 1224720, while the sum is 53.

The square root of 129735899 is about 11390.1667678748. The cubic root of 129735899 is about 506.2364226608.

The spelling of 129735899 in words is "one hundred twenty-nine million, seven hundred thirty-five thousand, eight hundred ninety-nine".