125043889 has 2 divisors, whose sum is σ = 125043890. Its totient is φ = 125043888.

The previous prime is 125043887. The next prime is 125043901. The reversal of 125043889 is 988340521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 104040000 + 21003889 = 10200^2 + 4583^2 .

It is a cyclic number.

It is not a de Polignac number, because 125043889 - 2¹ = 125043887 is a prime.

Together with 125043887, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (125043887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62521944 + 62521945.

It is an arithmetic number, because the mean of its divisors is an integer number (62521945).

Almost surely, 2^125043889 is an apocalyptic number.

It is an amenable number.

125043889 is a deficient number, since it is larger than the sum of its proper divisors (1).

125043889 is an equidigital number, since it uses as much as digits as its factorization.

125043889 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69120, while the sum is 40.

The square root of 125043889 is about 11182.3024909899. The cubic root of 125043889 is about 500.0585118191.

The spelling of 125043889 in words is "one hundred twenty-five million, forty-three thousand, eight hundred eighty-nine".