125171496987 has 4 divisors (see below), whose sum is σ = 166895329320. Its totient is φ = 83447664656.

The previous prime is 125171496979. The next prime is 125171497039. The reversal of 125171496987 is 789694171521.

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 125171496987 - 2³ = 125171496979 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 125171496987.

It is not an unprimeable number, because it can be changed into a prime (125171496887) 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, 20861916162 + ... + 20861916167.

It is an arithmetic number, because the mean of its divisors is an integer number (41723832330).

Almost surely, 2^125171496987 is an apocalyptic number.

125171496987 is a deficient number, since it is larger than the sum of its proper divisors (41723832333).

125171496987 is an equidigital number, since it uses as much as digits as its factorization.

125171496987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41723832332.

The product of its digits is 7620480, while the sum is 60.

The spelling of 125171496987 in words is "one hundred twenty-five billion, one hundred seventy-one million, four hundred ninety-six thousand, nine hundred eighty-seven".