51243223431 has 8 divisors (see below), whose sum is σ = 68326120960. Its totient is φ = 34161237432.

The previous prime is 51243223429. The next prime is 51243223433. The reversal of 51243223431 is 13432234215.

It is an interprime number because it is at equal distance from previous prime (51243223429) and next prime (51243223433).

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

It is not a de Polignac number, because 51243223431 - 2¹ = 51243223429 is a prime.

It is a super-2 number, since 2×51243223431² (a number of 22 digits) 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 (51243223433) 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, 83671 + ... + 330888.

It is an arithmetic number, because the mean of its divisors is an integer number (8540765120).

Almost surely, 2^51243223431 is an apocalyptic number.

51243223431 is a deficient number, since it is larger than the sum of its proper divisors (17082897529).

51243223431 is a wasteful number, since it uses less digits than its factorization.

51243223431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 455765.

The product of its digits is 17280, while the sum is 30.

Adding to 51243223431 its reverse (13432234215), we get a palindrome (64675457646).

The spelling of 51243223431 in words is "fifty-one billion, two hundred forty-three million, two hundred twenty-three thousand, four hundred thirty-one".