50409721 has 4 divisors (see below), whose sum is σ = 52601472. Its totient is φ = 48217972.

The previous prime is 50409713. The next prime is 50409727. The reversal of 50409721 is 12790405.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12790405 = 5 ⋅2558081.

It is a cyclic number.

It is not a de Polignac number, because 50409721 - 2³ = 50409713 is a prime.

It is a super-2 number, since 2×50409721² = 5082279942595682, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 50409721.

It is not an unprimeable number, because it can be changed into a prime (50409727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1095841 + ... + 1095886.

It is an arithmetic number, because the mean of its divisors is an integer number (13150368).

Almost surely, 2^50409721 is an apocalyptic number.

It is an amenable number.

50409721 is a deficient number, since it is larger than the sum of its proper divisors (2191751).

50409721 is a wasteful number, since it uses less digits than its factorization.

50409721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2191750.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 50409721 is about 7099.9803520855. The cubic root of 50409721 is about 369.4066970527.

The spelling of 50409721 in words is "fifty million, four hundred nine thousand, seven hundred twenty-one".