125356409 has 2 divisors, whose sum is σ = 125356410. Its totient is φ = 125356408.

The previous prime is 125356373. The next prime is 125356499. The reversal of 125356409 is 904653521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 103938025 + 21418384 = 10195^2 + 4628^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-125356409 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (125356499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62678204 + 62678205.

It is an arithmetic number, because the mean of its divisors is an integer number (62678205).

Almost surely, 2^125356409 is an apocalyptic number.

It is an amenable number.

125356409 is a deficient number, since it is larger than the sum of its proper divisors (1).

125356409 is an equidigital number, since it uses as much as digits as its factorization.

125356409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32400, while the sum is 35.

The square root of 125356409 is about 11196.2676370298. The cubic root of 125356409 is about 500.4747610612.

The spelling of 125356409 in words is "one hundred twenty-five million, three hundred fifty-six thousand, four hundred nine".