125089981 has 2 divisors, whose sum is σ = 125089982. Its totient is φ = 125089980.

The previous prime is 125089969. The next prime is 125089997. The reversal of 125089981 is 189980521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 101324356 + 23765625 = 10066^2 + 4875^2 .

It is a cyclic number.

It is not a de Polignac number, because 125089981 - 2¹⁷ = 124958909 is a prime.

It is a super-2 number, since 2×125089981² = 31295006693160722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125080981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62544990 + 62544991.

It is an arithmetic number, because the mean of its divisors is an integer number (62544991).

Almost surely, 2^125089981 is an apocalyptic number.

It is an amenable number.

125089981 is a deficient number, since it is larger than the sum of its proper divisors (1).

125089981 is an equidigital number, since it uses as much as digits as its factorization.

125089981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51840, while the sum is 43.

The square root of 125089981 is about 11184.3632362330. The cubic root of 125089981 is about 500.1199458903.

The spelling of 125089981 in words is "one hundred twenty-five million, eighty-nine thousand, nine hundred eighty-one".