50661251 has 4 divisors (see below), whose sum is σ = 52030512. Its totient is φ = 49291992.

The previous prime is 50661229. The next prime is 50661263. The reversal of 50661251 is 15216605.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15216605 = 5 ⋅3043321.

It is not a de Polignac number, because 50661251 - 2⁶ = 50661187 is a prime.

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 50661251.

It is not an unprimeable number, because it can be changed into a prime (50661211) 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, 684575 + ... + 684648.

It is an arithmetic number, because the mean of its divisors is an integer number (13007628).

Almost surely, 2^50661251 is an apocalyptic number.

50661251 is a deficient number, since it is larger than the sum of its proper divisors (1369261).

50661251 is a wasteful number, since it uses less digits than its factorization.

50661251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1369260.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 50661251 is about 7117.6717401128. The cubic root of 50661251 is about 370.0200889993.

Adding to 50661251 its reverse (15216605), we get a palindrome (65877856).

The spelling of 50661251 in words is "fifty million, six hundred sixty-one thousand, two hundred fifty-one".