51435132013 has 4 divisors (see below), whose sum is σ = 51448696348. Its totient is φ = 51421567680.

The previous prime is 51435131941. The next prime is 51435132043. The reversal of 51435132013 is 31023153415.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 27616457124 + 23818674889 = 166182^2 + 154333^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51435132013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51435132043) 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, 6776478 + ... + 6784063.

It is an arithmetic number, because the mean of its divisors is an integer number (12862174087).

Almost surely, 2^51435132013 is an apocalyptic number.

It is an amenable number.

51435132013 is a deficient number, since it is larger than the sum of its proper divisors (13564335).

51435132013 is a wasteful number, since it uses less digits than its factorization.

51435132013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13564334.

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

Adding to 51435132013 its reverse (31023153415), we get a palindrome (82458285428).

The spelling of 51435132013 in words is "fifty-one billion, four hundred thirty-five million, one hundred thirty-two thousand, thirteen".