50917721 has 4 divisors (see below), whose sum is σ = 51634944. Its totient is φ = 50200500.

The previous prime is 50917709. The next prime is 50917733. The reversal of 50917721 is 12771905.

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.

It is an interprime number because it is at equal distance from previous prime (50917709) and next prime (50917733).

It is a cyclic number.

It is not a de Polignac number, because 50917721 - 2¹⁴ = 50901337 is a prime.

It is a super-2 number, since 2×50917721² = 5185228623667682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (50917751) 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, 358505 + ... + 358646.

It is an arithmetic number, because the mean of its divisors is an integer number (12908736).

Almost surely, 2^50917721 is an apocalyptic number.

It is an amenable number.

50917721 is a deficient number, since it is larger than the sum of its proper divisors (717223).

50917721 is an equidigital number, since it uses as much as digits as its factorization.

50917721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 717222.

The product of its (nonzero) digits is 4410, while the sum is 32.

The square root of 50917721 is about 7135.6654209681. The cubic root of 50917721 is about 370.6434408952.

The spelling of 50917721 in words is "fifty million, nine hundred seventeen thousand, seven hundred twenty-one".