125001881 has 2 divisors, whose sum is σ = 125001882. Its totient is φ = 125001880.

The previous prime is 125001859. The next prime is 125001883. The reversal of 125001881 is 188100521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 94575625 + 30426256 = 9725^2 + 5516^2 .

It is a cyclic number.

It is not a de Polignac number, because 125001881 - 2¹⁰ = 125000857 is a prime.

It is a super-2 number, since 2×125001881² = 31250940507076322, which contains 22 as substring.

Together with 125001883, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 125001881.

It is not a weakly prime, because it can be changed into another prime (125001883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62500940 + 62500941.

It is an arithmetic number, because the mean of its divisors is an integer number (62500941).

Almost surely, 2^125001881 is an apocalyptic number.

It is an amenable number.

125001881 is a deficient number, since it is larger than the sum of its proper divisors (1).

125001881 is an equidigital number, since it uses as much as digits as its factorization.

125001881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 640, while the sum is 26.

The square root of 125001881 is about 11180.4240080598. The cubic root of 125001881 is about 500.0025079874.

The spelling of 125001881 in words is "one hundred twenty-five million, one thousand, eight hundred eighty-one".