125820591929 has 4 divisors (see below), whose sum is σ = 130159233060. Its totient is φ = 121481950800.

The previous prime is 125820591907. The next prime is 125820591931. The reversal of 125820591929 is 929195028521.

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 54862287529 + 70958304400 = 234227^2 + 266380^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-125820591929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125820591229) 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, 2169320522 + ... + 2169320579.

It is an arithmetic number, because the mean of its divisors is an integer number (32539808265).

Almost surely, 2^125820591929 is an apocalyptic number.

It is an amenable number.

125820591929 is a deficient number, since it is larger than the sum of its proper divisors (4338641131).

125820591929 is an equidigital number, since it uses as much as digits as its factorization.

125820591929 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4338641130.

The product of its (nonzero) digits is 1166400, while the sum is 53.

The spelling of 125820591929 in words is "one hundred twenty-five billion, eight hundred twenty million, five hundred ninety-one thousand, nine hundred twenty-nine".