125432009 has 2 divisors, whose sum is σ = 125432010. Its totient is φ = 125432008.

The previous prime is 125432003. The next prime is 125432017. The reversal of 125432009 is 900234521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73188025 + 52243984 = 8555^2 + 7228^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-125432009 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (125432003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62716004 + 62716005.

It is an arithmetic number, because the mean of its divisors is an integer number (62716005).

Almost surely, 2^125432009 is an apocalyptic number.

It is an amenable number.

125432009 is a deficient number, since it is larger than the sum of its proper divisors (1).

125432009 is an equidigital number, since it uses as much as digits as its factorization.

125432009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 125432009 is about 11199.6432532470. The cubic root of 125432009 is about 500.5753496915.

The spelling of 125432009 in words is "one hundred twenty-five million, four hundred thirty-two thousand, nine".