125051261 has 2 divisors, whose sum is σ = 125051262. Its totient is φ = 125051260.

The previous prime is 125051257. The next prime is 125051273. The reversal of 125051261 is 162150521.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 79744900 + 45306361 = 8930^2 + 6731^2 .

It is a cyclic number.

It is not a de Polignac number, because 125051261 - 2² = 125051257 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125051291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62525630 + 62525631.

It is an arithmetic number, because the mean of its divisors is an integer number (62525631).

Almost surely, 2^125051261 is an apocalyptic number.

It is an amenable number.

125051261 is a deficient number, since it is larger than the sum of its proper divisors (1).

125051261 is an equidigital number, since it uses as much as digits as its factorization.

125051261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 600, while the sum is 23.

The square root of 125051261 is about 11182.6321141313. The cubic root of 125051261 is about 500.0683386592.

The spelling of 125051261 in words is "one hundred twenty-five million, fifty-one thousand, two hundred sixty-one".