129012887 has 4 divisors (see below), whose sum is σ = 130462560. Its totient is φ = 127563216.

The previous prime is 129012883. The next prime is 129012889. The reversal of 129012887 is 788210921.

129012887 = T₁₆₅₈ + T₁₆₅₉ + ... + T₁₇₄₆.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 129012887 - 2² = 129012883 is a prime.

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 129012887.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129012883) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 724703 + ... + 724880.

It is an arithmetic number, because the mean of its divisors is an integer number (32615640).

Almost surely, 2^129012887 is an apocalyptic number.

129012887 is a deficient number, since it is larger than the sum of its proper divisors (1449673).

129012887 is an equidigital number, since it uses as much as digits as its factorization.

129012887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1449672.

The product of its (nonzero) digits is 16128, while the sum is 38.

The square root of 129012887 is about 11358.3839959741. The cubic root of 129012887 is about 505.2942597686.

The spelling of 129012887 in words is "one hundred twenty-nine million, twelve thousand, eight hundred eighty-seven".