125541953261 has 2 divisors, whose sum is σ = 125541953262. Its totient is φ = 125541953260.

The previous prime is 125541953233. The next prime is 125541953267. The reversal of 125541953261 is 162359145521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 76767230761 + 48774722500 = 277069^2 + 220850^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-125541953261 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125541953267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62770976630 + 62770976631.

It is an arithmetic number, because the mean of its divisors is an integer number (62770976631).

Almost surely, 2^125541953261 is an apocalyptic number.

It is an amenable number.

125541953261 is a deficient number, since it is larger than the sum of its proper divisors (1).

125541953261 is an equidigital number, since it uses as much as digits as its factorization.

125541953261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 324000, while the sum is 44.

The spelling of 125541953261 in words is "one hundred twenty-five billion, five hundred forty-one million, nine hundred fifty-three thousand, two hundred sixty-one".