50406509 has 4 divisors (see below), whose sum is σ = 50685180. Its totient is φ = 50127840.

The previous prime is 50406497. The next prime is 50406511. The reversal of 50406509 is 90560405.

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 8868484 + 41538025 = 2978^2 + 6445^2 .

It is a cyclic number.

It is not a de Polignac number, because 50406509 - 2⁴ = 50406493 is a prime.

It is a super-2 number, since 2×50406509² = 5081632299134162, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (50406529) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 139064 + ... + 139425.

It is an arithmetic number, because the mean of its divisors is an integer number (12671295).

Almost surely, 2^50406509 is an apocalyptic number.

It is an amenable number.

50406509 is a deficient number, since it is larger than the sum of its proper divisors (278671).

50406509 is a wasteful number, since it uses less digits than its factorization.

50406509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278670.

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 50406509 is about 7099.7541506731. The cubic root of 50406509 is about 369.3988509502.

The spelling of 50406509 in words is "fifty million, four hundred six thousand, five hundred nine".