51171231 has 8 divisors (see below), whose sum is σ = 69384960. Its totient is φ = 33535832.

The previous prime is 51171229. The next prime is 51171257. The reversal of 51171231 is 13217115.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51171231 - 2¹ = 51171229 is a prime.

It is a super-2 number, since 2×51171231² = 5236989764110722, which contains 22 as substring.

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 51171198 and 51171207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51171271) 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, 144375 + ... + 144728.

It is an arithmetic number, because the mean of its divisors is an integer number (8673120).

Almost surely, 2^51171231 is an apocalyptic number.

51171231 is a deficient number, since it is larger than the sum of its proper divisors (18213729).

51171231 is a wasteful number, since it uses less digits than its factorization.

51171231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289165.

The product of its digits is 210, while the sum is 21.

The square root of 51171231 is about 7153.4069505376. The cubic root of 51171231 is about 371.2575447684.

Adding to 51171231 its reverse (13217115), we get a palindrome (64388346).

The spelling of 51171231 in words is "fifty-one million, one hundred seventy-one thousand, two hundred thirty-one".