51355438 has 4 divisors (see below), whose sum is σ = 77033160. Its totient is φ = 25677718.

The previous prime is 51355379. The next prime is 51355439. The reversal of 51355438 is 83455315.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51355439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12838858 + ... + 12838861.

It is an arithmetic number, because the mean of its divisors is an integer number (19258290).

Almost surely, 2^51355438 is an apocalyptic number.

51355438 is a deficient number, since it is larger than the sum of its proper divisors (25677722).

51355438 is a wasteful number, since it uses less digits than its factorization.

51355438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25677721.

The product of its digits is 36000, while the sum is 34.

The square root of 51355438 is about 7166.2708572869. The cubic root of 51355438 is about 371.7024975231.

The spelling of 51355438 in words is "fifty-one million, three hundred fifty-five thousand, four hundred thirty-eight".