125282021 has 2 divisors, whose sum is σ = 125282022. Its totient is φ = 125282020.

The previous prime is 125282009. The next prime is 125282039. The reversal of 125282021 is 120282521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 121859521 + 3422500 = 11039^2 + 1850^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-125282021 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125282051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62641010 + 62641011.

It is an arithmetic number, because the mean of its divisors is an integer number (62641011).

Almost surely, 2^125282021 is an apocalyptic number.

It is an amenable number.

125282021 is a deficient number, since it is larger than the sum of its proper divisors (1).

125282021 is an equidigital number, since it uses as much as digits as its factorization.

125282021 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 23.

The square root of 125282021 is about 11192.9451441522. The cubic root of 125282021 is about 500.3757455598.

The spelling of 125282021 in words is "one hundred twenty-five million, two hundred eighty-two thousand, twenty-one".