125143649 has 2 divisors, whose sum is σ = 125143650. Its totient is φ = 125143648.

The previous prime is 125143607. The next prime is 125143673. The reversal of 125143649 is 946341521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 75342400 + 49801249 = 8680^2 + 7057^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-125143649 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (125143349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62571824 + 62571825.

It is an arithmetic number, because the mean of its divisors is an integer number (62571825).

Almost surely, 2^125143649 is an apocalyptic number.

It is an amenable number.

125143649 is a deficient number, since it is larger than the sum of its proper divisors (1).

125143649 is an equidigital number, since it uses as much as digits as its factorization.

125143649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25920, while the sum is 35.

The square root of 125143649 is about 11186.7622214830. The cubic root of 125143649 is about 500.1914586778.

The spelling of 125143649 in words is "one hundred twenty-five million, one hundred forty-three thousand, six hundred forty-nine".