50251561 has 6 divisors (see below), whose sum is σ = 53035962. Its totient is φ = 47606400.

The previous prime is 50251559. The next prime is 50251567. The reversal of 50251561 is 16515205.

It can be written as a sum of positive squares in only one way, i.e., 37896336 + 12355225 = 6156^2 + 3515^2 .

It is not a de Polignac number, because 50251561 - 2¹ = 50251559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (50251567) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 69240 + ... + 69961.

It is an arithmetic number, because the mean of its divisors is an integer number (8839327).

Almost surely, 2^50251561 is an apocalyptic number.

It is an amenable number.

50251561 is a deficient number, since it is larger than the sum of its proper divisors (2784401).

50251561 is a wasteful number, since it uses less digits than its factorization.

50251561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139239 (or 139220 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 25.

The square root of 50251561 is about 7088.8335429745. The cubic root of 50251561 is about 369.0199556876.

Adding to 50251561 its reverse (16515205), we get a palindrome (66766766).

The spelling of 50251561 in words is "fifty million, two hundred fifty-one thousand, five hundred sixty-one".