125821181 has 2 divisors, whose sum is σ = 125821182. Its totient is φ = 125821180.

The previous prime is 125821151. The next prime is 125821183. The reversal of 125821181 is 181128521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 120340900 + 5480281 = 10970^2 + 2341^2 .

It is a cyclic number.

It is not a de Polignac number, because 125821181 - 2⁶ = 125821117 is a prime.

It is a super-2 number, since 2×125821181² = 31661939176469522, which contains 22 as substring.

Together with 125821183, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125821183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62910590 + 62910591.

It is an arithmetic number, because the mean of its divisors is an integer number (62910591).

Almost surely, 2^125821181 is an apocalyptic number.

It is an amenable number.

125821181 is a deficient number, since it is larger than the sum of its proper divisors (1).

125821181 is an equidigital number, since it uses as much as digits as its factorization.

125821181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1280, while the sum is 29.

The square root of 125821181 is about 11217.0041009175. The cubic root of 125821181 is about 501.0925190655.

The spelling of 125821181 in words is "one hundred twenty-five million, eight hundred twenty-one thousand, one hundred eighty-one".