125813221829 has 8 divisors (see below), whose sum is σ = 126124939800. Its totient is φ = 125501644800.

The previous prime is 125813221799. The next prime is 125813221871. The reversal of 125813221829 is 928122318521.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 98233976929 + 27579244900 = 313423^2 + 166070^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-125813221829 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 125813221829.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125813221879) 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 7 ways as a sum of consecutive naturals, for example, 1880309 + ... + 1946069.

It is an arithmetic number, because the mean of its divisors is an integer number (15765617475).

Almost surely, 2^125813221829 is an apocalyptic number.

It is an amenable number.

125813221829 is a deficient number, since it is larger than the sum of its proper divisors (311717971).

125813221829 is an equidigital number, since it uses as much as digits as its factorization.

125813221829 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70471.

The product of its digits is 138240, while the sum is 44.

The spelling of 125813221829 in words is "one hundred twenty-five billion, eight hundred thirteen million, two hundred twenty-one thousand, eight hundred twenty-nine".