125200409 has 2 divisors, whose sum is σ = 125200410. Its totient is φ = 125200408.

The previous prime is 125200403. The next prime is 125200441. The reversal of 125200409 is 904002521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64048009 + 61152400 = 8003^2 + 7820^2 .

It is an emirp because it is prime and its reverse (904002521) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-125200409 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (125200403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62600204 + 62600205.

It is an arithmetic number, because the mean of its divisors is an integer number (62600205).

Almost surely, 2^125200409 is an apocalyptic number.

It is an amenable number.

125200409 is a deficient number, since it is larger than the sum of its proper divisors (1).

125200409 is an equidigital number, since it uses as much as digits as its factorization.

125200409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 125200409 is about 11189.2988609653. The cubic root of 125200409 is about 500.2670693226.

The spelling of 125200409 in words is "one hundred twenty-five million, two hundred thousand, four hundred nine".