51224531 has 4 divisors (see below), whose sum is σ = 51484752. Its totient is φ = 50964312.

The previous prime is 51224507. The next prime is 51224549. The reversal of 51224531 is 13542215.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13542215 = 5 ⋅2708443.

It is a cyclic number.

It is not a de Polignac number, because 51224531 - 2¹⁴ = 51208147 is a prime.

It is a super-2 number, since 2×51224531² = 5247905152339922, 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 = 51224497 and 51224506.

It is not an unprimeable number, because it can be changed into a prime (51224231) 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, 129815 + ... + 130208.

It is an arithmetic number, because the mean of its divisors is an integer number (12871188).

Almost surely, 2^51224531 is an apocalyptic number.

51224531 is a deficient number, since it is larger than the sum of its proper divisors (260221).

51224531 is a wasteful number, since it uses less digits than its factorization.

51224531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260220.

The product of its digits is 1200, while the sum is 23.

The square root of 51224531 is about 7157.1314784626. The cubic root of 51224531 is about 371.3864007702.

Adding to 51224531 its reverse (13542215), we get a palindrome (64766746).

The spelling of 51224531 in words is "fifty-one million, two hundred twenty-four thousand, five hundred thirty-one".