129870142987 has 4 divisors (see below), whose sum is σ = 139860154000. Its totient is φ = 119880131976.

The previous prime is 129870142973. The next prime is 129870142993. The reversal of 129870142987 is 789241078921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 789241078921 = 197 ⋅4006299893.

It is a cyclic number.

It is not a de Polignac number, because 129870142987 - 2⁷ = 129870142859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129870142967) 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, 4995005487 + ... + 4995005512.

It is an arithmetic number, because the mean of its divisors is an integer number (34965038500).

Almost surely, 2^129870142987 is an apocalyptic number.

129870142987 is a deficient number, since it is larger than the sum of its proper divisors (9990011013).

129870142987 is an equidigital number, since it uses as much as digits as its factorization.

129870142987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9990011012.

The product of its (nonzero) digits is 4064256, while the sum is 58.

The spelling of 129870142987 in words is "one hundred twenty-nine billion, eight hundred seventy million, one hundred forty-two thousand, nine hundred eighty-seven".