50729561 has 4 divisors (see below), whose sum is σ = 50769972. Its totient is φ = 50689152.

The previous prime is 50729537. The next prime is 50729599. The reversal of 50729561 is 16592705.

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 33131536 + 17598025 = 5756^2 + 4195^2 .

It is a cyclic number.

It is not a de Polignac number, because 50729561 - 2²² = 46535257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (50729501) 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, 18260 + ... + 20853.

It is an arithmetic number, because the mean of its divisors is an integer number (12692493).

Almost surely, 2^50729561 is an apocalyptic number.

It is an amenable number.

50729561 is a deficient number, since it is larger than the sum of its proper divisors (40411).

50729561 is a wasteful number, since it uses less digits than its factorization.

50729561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40410.

The product of its (nonzero) digits is 18900, while the sum is 35.

The square root of 50729561 is about 7122.4687433502. The cubic root of 50729561 is about 370.1863220328.

The spelling of 50729561 in words is "fifty million, seven hundred twenty-nine thousand, five hundred sixty-one".