51022231 has 4 divisors (see below), whose sum is σ = 54947032. Its totient is φ = 47097432.

The previous prime is 51022217. The next prime is 51022241. The reversal of 51022231 is 13222015.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13222015 = 5 ⋅2644403.

It is a cyclic number.

It is not a de Polignac number, because 51022231 - 2¹⁹ = 50497943 is a prime.

It is a super-2 number, since 2×51022231² = 5206536112434722, 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 (51022241) 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, 1962381 + ... + 1962406.

It is an arithmetic number, because the mean of its divisors is an integer number (13736758).

Almost surely, 2^51022231 is an apocalyptic number.

51022231 is a deficient number, since it is larger than the sum of its proper divisors (3924801).

51022231 is a wasteful number, since it uses less digits than its factorization.

51022231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3924800.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 51022231 is about 7142.9847402889. The cubic root of 51022231 is about 370.8968528261.

Adding to 51022231 its reverse (13222015), we get a palindrome (64244246).

The spelling of 51022231 in words is "fifty-one million, twenty-two thousand, two hundred thirty-one".