51353231 has 4 divisors (see below), whose sum is σ = 51528792. Its totient is φ = 51177672.

The previous prime is 51353191. The next prime is 51353249. The reversal of 51353231 is 13235315.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13235315 = 5 ⋅2647063.

It is a cyclic number.

It is not a de Polignac number, because 51353231 - 2⁶ = 51353167 is a prime.

It is a super-2 number, since 2×51353231² = 5274308668278722, 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 = 51353197 and 51353206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51353251) 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, 87341 + ... + 87926.

It is an arithmetic number, because the mean of its divisors is an integer number (12882198).

Almost surely, 2^51353231 is an apocalyptic number.

51353231 is a deficient number, since it is larger than the sum of its proper divisors (175561).

51353231 is a wasteful number, since it uses less digits than its factorization.

51353231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175560.

The product of its digits is 1350, while the sum is 23.

The square root of 51353231 is about 7166.1168703838. The cubic root of 51353231 is about 371.6971728084.

Adding to 51353231 its reverse (13235315), we get a palindrome (64588546).

The spelling of 51353231 in words is "fifty-one million, three hundred fifty-three thousand, two hundred thirty-one".