125309381 has 2 divisors, whose sum is σ = 125309382. Its totient is φ = 125309380.

The previous prime is 125309339. The next prime is 125309399. The reversal of 125309381 is 183903521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67092481 + 58216900 = 8191^2 + 7630^2 .

It is an emirp because it is prime and its reverse (183903521) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 125309381 - 2¹⁰ = 125308357 is a prime.

It is a super-2 number, since 2×125309381² = 31404881933206322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen 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 (125309081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62654690 + 62654691.

It is an arithmetic number, because the mean of its divisors is an integer number (62654691).

Almost surely, 2^125309381 is an apocalyptic number.

It is an amenable number.

125309381 is a deficient number, since it is larger than the sum of its proper divisors (1).

125309381 is an equidigital number, since it uses as much as digits as its factorization.

125309381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 125309381 is about 11194.1672758629. The cubic root of 125309381 is about 500.4121681415.

The spelling of 125309381 in words is "one hundred twenty-five million, three hundred nine thousand, three hundred eighty-one".