129750231986 has 4 divisors (see below), whose sum is σ = 194625347982. Its totient is φ = 64875115992.

The previous prime is 129750231953. The next prime is 129750231997. The reversal of 129750231986 is 689132057921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 689132057921 = 73 ⋅9440165177.

It can be written as a sum of positive squares in only one way, i.e., 69218979025 + 60531252961 = 263095^2 + 246031^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32437557995 + ... + 32437557998.

Almost surely, 2^129750231986 is an apocalyptic number.

129750231986 is a deficient number, since it is larger than the sum of its proper divisors (64875115996).

129750231986 is an equidigital number, since it uses as much as digits as its factorization.

129750231986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64875115995.

The product of its (nonzero) digits is 1632960, while the sum is 53.

The spelling of 129750231986 in words is "one hundred twenty-nine billion, seven hundred fifty million, two hundred thirty-one thousand, nine hundred eighty-six".