125731349 has 2 divisors, whose sum is σ = 125731350. Its totient is φ = 125731348.

The previous prime is 125731321. The next prime is 125731351. The reversal of 125731349 is 943137521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 116791249 + 8940100 = 10807^2 + 2990^2 .

It is a cyclic number.

It is not a de Polignac number, because 125731349 - 2²⁰ = 124682773 is a prime.

It is a Sophie Germain prime.

Together with 125731351, it forms a pair of twin primes.

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 (125751349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62865674 + 62865675.

It is an arithmetic number, because the mean of its divisors is an integer number (62865675).

Almost surely, 2^125731349 is an apocalyptic number.

It is an amenable number.

125731349 is a deficient number, since it is larger than the sum of its proper divisors (1).

125731349 is an equidigital number, since it uses as much as digits as its factorization.

125731349 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22680, while the sum is 35.

The square root of 125731349 is about 11212.9991081780. Note that the first 3 decimals coincide. The cubic root of 125731349 is about 500.9732363927.

The spelling of 125731349 in words is "one hundred twenty-five million, seven hundred thirty-one thousand, three hundred forty-nine".