19531252129 has 4 divisors (see below), whose sum is σ = 19533201940. Its totient is φ = 19529302320.

The previous prime is 19531252067. The next prime is 19531252151. The reversal of 19531252129 is 92125213591.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 5289216529 + 14242035600 = 72727^2 + 119340^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19531252129 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19531252091 and 19531252100.

It is not an unprimeable number, because it can be changed into a prime (19531252199) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 959802 + ... + 979939.

It is an arithmetic number, because the mean of its divisors is an integer number (4883300485).

Almost surely, 2^19531252129 is an apocalyptic number.

It is an amenable number.

19531252129 is a deficient number, since it is larger than the sum of its proper divisors (1949811).

19531252129 is a wasteful number, since it uses less digits than its factorization.

19531252129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1949810.

The product of its digits is 48600, while the sum is 40.

The spelling of 19531252129 in words is "nineteen billion, five hundred thirty-one million, two hundred fifty-two thousand, one hundred twenty-nine".