51434381 has 4 divisors (see below), whose sum is σ = 51452064. Its totient is φ = 51416700.

The previous prime is 51434303. The next prime is 51434423. The reversal of 51434381 is 18343415.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51434381 is a prime.

It is a super-2 number, since 2×51434381² = 5290991097706322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51494381) 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, 3335 + ... + 10676.

It is an arithmetic number, because the mean of its divisors is an integer number (12863016).

Almost surely, 2^51434381 is an apocalyptic number.

It is an amenable number.

51434381 is a deficient number, since it is larger than the sum of its proper divisors (17683).

51434381 is a wasteful number, since it uses less digits than its factorization.

51434381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17682.

The product of its digits is 5760, while the sum is 29.

The square root of 51434381 is about 7171.7766975834. The cubic root of 51434381 is about 371.8928589780.

Adding to 51434381 its reverse (18343415), we get a palindrome (69777796).

It can be divided in two parts, 51434 and 381, that added together give a palindrome (51815).

The spelling of 51434381 in words is "fifty-one million, four hundred thirty-four thousand, three hundred eighty-one".