125250525121 has 4 divisors (see below), whose sum is σ = 125415112644. Its totient is φ = 125085937600.

The previous prime is 125250525073. The next prime is 125250525131. The reversal of 125250525121 is 121525052521.

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 21885060096 + 103365465025 = 147936^2 + 321505^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-125250525121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125250525131) 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, 82292620 + ... + 82294141.

It is an arithmetic number, because the mean of its divisors is an integer number (31353778161).

Almost surely, 2^125250525121 is an apocalyptic number.

It is an amenable number.

125250525121 is a deficient number, since it is larger than the sum of its proper divisors (164587523).

125250525121 is an equidigital number, since it uses as much as digits as its factorization.

125250525121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164587522.

The product of its (nonzero) digits is 10000, while the sum is 31.

Adding to 125250525121 its reverse (121525052521), we get a palindrome (246775577642).

The spelling of 125250525121 in words is "one hundred twenty-five billion, two hundred fifty million, five hundred twenty-five thousand, one hundred twenty-one".