51435031231 has 8 divisors (see below), whose sum is σ = 52857090000. Its totient is φ = 50023240512.

The previous prime is 51435031229. The next prime is 51435031247. The reversal of 51435031231 is 13213053415.

It is a happy number.

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 51435031231 - 2¹ = 51435031229 is a prime.

It is a super-2 number, since 2×51435031231² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51435031231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51435031201) 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, 2556856 + ... + 2576893.

It is an arithmetic number, because the mean of its divisors is an integer number (6607136250).

Almost surely, 2^51435031231 is an apocalyptic number.

51435031231 is a deficient number, since it is larger than the sum of its proper divisors (1422058769).

51435031231 is a wasteful number, since it uses less digits than its factorization.

51435031231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5134025.

The product of its (nonzero) digits is 5400, while the sum is 28.

Adding to 51435031231 its reverse (13213053415), we get a palindrome (64648084646).

The spelling of 51435031231 in words is "fifty-one billion, four hundred thirty-five million, thirty-one thousand, two hundred thirty-one".