51425251 has 4 divisors (see below), whose sum is σ = 51460000. Its totient is φ = 51390504.

The previous prime is 51425243. The next prime is 51425273. The reversal of 51425251 is 15252415.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15252415 = 5 ⋅3050483.

It is a cyclic number.

It is not a de Polignac number, because 51425251 - 2³ = 51425243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51425351) 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, 15051 + ... + 18148.

It is an arithmetic number, because the mean of its divisors is an integer number (12865000).

Almost surely, 2^51425251 is an apocalyptic number.

51425251 is a deficient number, since it is larger than the sum of its proper divisors (34749).

51425251 is a wasteful number, since it uses less digits than its factorization.

51425251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34748.

The product of its digits is 2000, while the sum is 25.

The square root of 51425251 is about 7171.1401464481. The cubic root of 51425251 is about 371.8708530574.

Adding to 51425251 its reverse (15252415), we get a palindrome (66677666).

The spelling of 51425251 in words is "fifty-one million, four hundred twenty-five thousand, two hundred fifty-one".