125750909 has 2 divisors, whose sum is σ = 125750910. Its totient is φ = 125750908.

The previous prime is 125750899. The next prime is 125750917. The reversal of 125750909 is 909057521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 112826884 + 12924025 = 10622^2 + 3595^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-125750909 is a prime.

It is a super-2 number, since 2×125750909² = 31626582228652562, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125750929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62875454 + 62875455.

It is an arithmetic number, because the mean of its divisors is an integer number (62875455).

Almost surely, 2^125750909 is an apocalyptic number.

It is an amenable number.

125750909 is a deficient number, since it is larger than the sum of its proper divisors (1).

125750909 is an equidigital number, since it uses as much as digits as its factorization.

125750909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28350, while the sum is 38.

The square root of 125750909 is about 11213.8712762364. The cubic root of 125750909 is about 500.9992138133. Note that the first 3 decimals are identical.

The spelling of 125750909 in words is "one hundred twenty-five million, seven hundred fifty thousand, nine hundred nine".