125545961 has 2 divisors, whose sum is σ = 125545962. Its totient is φ = 125545960.

The previous prime is 125545957. The next prime is 125545993. The reversal of 125545961 is 169545521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 124188736 + 1357225 = 11144^2 + 1165^2 .

It is an emirp because it is prime and its reverse (169545521) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 125545961 - 2² = 125545957 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (125545951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62772980 + 62772981.

It is an arithmetic number, because the mean of its divisors is an integer number (62772981).

Almost surely, 2^125545961 is an apocalyptic number.

It is an amenable number.

125545961 is a deficient number, since it is larger than the sum of its proper divisors (1).

125545961 is an equidigital number, since it uses as much as digits as its factorization.

125545961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54000, while the sum is 38.

The square root of 125545961 is about 11204.7294032475. The cubic root of 125545961 is about 500.7268907476.

The spelling of 125545961 in words is "one hundred twenty-five million, five hundred forty-five thousand, nine hundred sixty-one".