51212231 has 8 divisors (see below), whose sum is σ = 60546720. Its totient is φ = 42382368.

The previous prime is 51212221. The next prime is 51212261. The reversal of 51212231 is 13221215.

It is a happy number.

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

It is not a de Polignac number, because 51212231 - 2⁶ = 51212167 is a prime.

It is a super-2 number, since 2×51212231² = 5245385207994722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51212221) 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, 125936 + ... + 126341.

It is an arithmetic number, because the mean of its divisors is an integer number (7568340).

Almost surely, 2^51212231 is an apocalyptic number.

51212231 is a deficient number, since it is larger than the sum of its proper divisors (9334489).

51212231 is a wasteful number, since it uses less digits than its factorization.

51212231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252313.

The product of its digits is 120, while the sum is 17.

The square root of 51212231 is about 7156.2721440705. The cubic root of 51212231 is about 371.3566727062.

Adding to 51212231 its reverse (13221215), we get a palindrome (64433446).

The spelling of 51212231 in words is "fifty-one million, two hundred twelve thousand, two hundred thirty-one".