51135323502 has 64 divisors (see below), whose sum is σ = 108857032704. Its totient is φ = 15958187520.

The previous prime is 51135323497. The next prime is 51135323507. The reversal of 51135323502 is 20532353115.

It is an interprime number because it is at equal distance from previous prime (51135323497) and next prime (51135323507).

It is a super-2 number, since 2×51135323502² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51135323502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51135323507) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16835928 + ... + 16838964.

It is an arithmetic number, because the mean of its divisors is an integer number (1700891136).

Almost surely, 2^51135323502 is an apocalyptic number.

51135323502 is an abundant number, since it is smaller than the sum of its proper divisors (57721709202).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51135323502 is a wasteful number, since it uses less digits than its factorization.

51135323502 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3873.

The product of its (nonzero) digits is 13500, while the sum is 30.

Adding to 51135323502 its reverse (20532353115), we get a palindrome (71667676617).

The spelling of 51135323502 in words is "fifty-one billion, one hundred thirty-five million, three hundred twenty-three thousand, five hundred two".