51435140431 has 4 divisors (see below), whose sum is σ = 51552305200. Its totient is φ = 51317975664.

The previous prime is 51435140417. The next prime is 51435140437. The reversal of 51435140431 is 13404153415.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51435140431 - 2⁹ = 51435139919 is a prime.

It is a super-2 number, since 2×51435140431² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51435140393 and 51435140402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51435140437) 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, 58581726 + ... + 58582603.

It is an arithmetic number, because the mean of its divisors is an integer number (12888076300).

Almost surely, 2^51435140431 is an apocalyptic number.

51435140431 is a deficient number, since it is larger than the sum of its proper divisors (117164769).

51435140431 is a wasteful number, since it uses less digits than its factorization.

51435140431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117164768.

The product of its (nonzero) digits is 14400, while the sum is 31.

Adding to 51435140431 its reverse (13404153415), we get a palindrome (64839293846).

The spelling of 51435140431 in words is "fifty-one billion, four hundred thirty-five million, one hundred forty thousand, four hundred thirty-one".