125828821 has 2 divisors, whose sum is σ = 125828822. Its totient is φ = 125828820.

The previous prime is 125828819. The next prime is 125828831. The reversal of 125828821 is 128828521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71216721 + 54612100 = 8439^2 + 7390^2 .

It is a cyclic number.

It is not a de Polignac number, because 125828821 - 2¹ = 125828819 is a prime.

Together with 125828819, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125828831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62914410 + 62914411.

It is an arithmetic number, because the mean of its divisors is an integer number (62914411).

Almost surely, 2^125828821 is an apocalyptic number.

It is an amenable number.

125828821 is a deficient number, since it is larger than the sum of its proper divisors (1).

125828821 is an equidigital number, since it uses as much as digits as its factorization.

125828821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20480, while the sum is 37.

The square root of 125828821 is about 11217.3446501389. The cubic root of 125828821 is about 501.1026611558.

The spelling of 125828821 in words is "one hundred twenty-five million, eight hundred twenty-eight thousand, eight hundred twenty-one".