51224431 has 8 divisors (see below), whose sum is σ = 53374464. Its totient is φ = 49105560.

The previous prime is 51224429. The next prime is 51224443. The reversal of 51224431 is 13442215.

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 51224431 - 2¹ = 51224429 is a prime.

It is a super-2 number, since 2×51224431² = 5247884662547522, 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 (51224461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4405 + ... + 11038.

It is an arithmetic number, because the mean of its divisors is an integer number (6671808).

Almost surely, 2^51224431 is an apocalyptic number.

51224431 is a deficient number, since it is larger than the sum of its proper divisors (2150033).

51224431 is a wasteful number, since it uses less digits than its factorization.

51224431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15581.

The product of its digits is 960, while the sum is 22.

The square root of 51224431 is about 7157.1244924201. The cubic root of 51224431 is about 371.3861590978.

Adding to 51224431 its reverse (13442215), we get a palindrome (64666646).

The spelling of 51224431 in words is "fifty-one million, two hundred twenty-four thousand, four hundred thirty-one".