125012581 has 2 divisors, whose sum is σ = 125012582. Its totient is φ = 125012580.

The previous prime is 125012561. The next prime is 125012633. The reversal of 125012581 is 185210521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 89132481 + 35880100 = 9441^2 + 5990^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-125012581 is a prime.

It is a super-2 number, since 2×125012581² = 31256290816563122, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125012501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62506290 + 62506291.

It is an arithmetic number, because the mean of its divisors is an integer number (62506291).

Almost surely, 2^125012581 is an apocalyptic number.

It is an amenable number.

125012581 is a deficient number, since it is larger than the sum of its proper divisors (1).

125012581 is an equidigital number, since it uses as much as digits as its factorization.

125012581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 800, while the sum is 25.

The square root of 125012581 is about 11180.9025127670. The cubic root of 125012581 is about 500.0167741039.

It can be divided in two parts, 1250 and 12581, that added together give a palindrome (13831).

The spelling of 125012581 in words is "one hundred twenty-five million, twelve thousand, five hundred eighty-one".