125729281 has 2 divisors, whose sum is σ = 125729282. Its totient is φ = 125729280.

The previous prime is 125729267. The next prime is 125729299. The reversal of 125729281 is 182927521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 117939600 + 7789681 = 10860^2 + 2791^2 .

It is a cyclic number.

It is not a de Polignac number, because 125729281 - 2¹⁵ = 125696513 is a prime.

It is a super-2 number, since 2×125729281² = 31615704201553922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 125729281.

It is not a weakly prime, because it can be changed into another prime (125729221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62864640 + 62864641.

It is an arithmetic number, because the mean of its divisors is an integer number (62864641).

Almost surely, 2^125729281 is an apocalyptic number.

It is an amenable number.

125729281 is a deficient number, since it is larger than the sum of its proper divisors (1).

125729281 is an equidigital number, since it uses as much as digits as its factorization.

125729281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20160, while the sum is 37.

The square root of 125729281 is about 11212.9068933974. The cubic root of 125729281 is about 500.9704897472.

The spelling of 125729281 in words is "one hundred twenty-five million, seven hundred twenty-nine thousand, two hundred eighty-one".