50707721 has 4 divisors (see below), whose sum is σ = 50798352. Its totient is φ = 50617092.

The previous prime is 50707711. The next prime is 50707759. The reversal of 50707721 is 12770705.

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: 12770705 = 5 ⋅2554141.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-50707721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (50707711) 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, 44471 + ... + 45596.

It is an arithmetic number, because the mean of its divisors is an integer number (12699588).

Almost surely, 2^50707721 is an apocalyptic number.

It is an amenable number.

50707721 is a deficient number, since it is larger than the sum of its proper divisors (90631).

50707721 is an equidigital number, since it uses as much as digits as its factorization.

50707721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90630.

The product of its (nonzero) digits is 3430, while the sum is 29.

The square root of 50707721 is about 7120.9354020381. The cubic root of 50707721 is about 370.1331904227.

The spelling of 50707721 in words is "fifty million, seven hundred seven thousand, seven hundred twenty-one".