51404131 has 4 divisors (see below), whose sum is σ = 51490264. Its totient is φ = 51318000.

The previous prime is 51404099. The next prime is 51404159. The reversal of 51404131 is 13140415.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13140415 = 5 ⋅2628083.

It is a cyclic number.

It is not a de Polignac number, because 51404131 - 2⁵ = 51404099 is a prime.

It is a super-2 number, since 2×51404131² = 5284769367730322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51404099 and 51404108.

It is not an unprimeable number, because it can be changed into a prime (51405131) 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, 42165 + ... + 43366.

It is an arithmetic number, because the mean of its divisors is an integer number (12872566).

Almost surely, 2^51404131 is an apocalyptic number.

51404131 is a deficient number, since it is larger than the sum of its proper divisors (86133).

51404131 is an equidigital number, since it uses as much as digits as its factorization.

51404131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86132.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 51404131 is about 7169.6674260387. The cubic root of 51404131 is about 371.8199378118.

Adding to 51404131 its reverse (13140415), we get a palindrome (64544546).

The spelling of 51404131 in words is "fifty-one million, four hundred four thousand, one hundred thirty-one".