125405405 has 4 divisors (see below), whose sum is σ = 150486492. Its totient is φ = 100324320.

The previous prime is 125405393. The next prime is 125405411. The reversal of 125405405 is 504504521.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 44063044 + 81342361 = 6638^2 + 9019^2 .

It is not a de Polignac number, because 125405405 - 2⁴ = 125405389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12540536 + ... + 12540545.

It is an arithmetic number, because the mean of its divisors is an integer number (37621623).

Almost surely, 2^125405405 is an apocalyptic number.

It is an amenable number.

125405405 is a deficient number, since it is larger than the sum of its proper divisors (25081087).

125405405 is an equidigital number, since it uses as much as digits as its factorization.

125405405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25081086.

The product of its (nonzero) digits is 4000, while the sum is 26.

The square root of 125405405 is about 11198.4554738589. The cubic root of 125405405 is about 500.5399566837.

Adding to 125405405 its reverse (504504521), we get a palindrome (629909926).

The spelling of 125405405 in words is "one hundred twenty-five million, four hundred five thousand, four hundred five".