51355431 has 8 divisors (see below), whose sum is σ = 76082160. Its totient is φ = 34236936.

The previous prime is 51355379. The next prime is 51355439. The reversal of 51355431 is 13455315.

It is not a de Polignac number, because 51355431 - 2¹³ = 51347239 is a prime.

It is a super-2 number, since 2×51355431² = 5274760586391522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 1902053 = 51355431 / (5 + 1 + 3 + 5 + 5 + 4 + 3 + 1).

It is a junction number, because it is equal to n+sod(n) for n = 51355395 and 51355404.

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 in 7 ways as a sum of consecutive naturals, for example, 951000 + ... + 951053.

It is an arithmetic number, because the mean of its divisors is an integer number (9510270).

Almost surely, 2^51355431 is an apocalyptic number.

51355431 is a deficient number, since it is larger than the sum of its proper divisors (24726729).

51355431 is a wasteful number, since it uses less digits than its factorization.

51355431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1902062 (or 1902056 counting only the distinct ones).

The product of its digits is 4500, while the sum is 27.

The square root of 51355431 is about 7166.2703688878. The cubic root of 51355431 is about 371.7024806348.

The spelling of 51355431 in words is "fifty-one million, three hundred fifty-five thousand, four hundred thirty-one".