51136730 has 16 divisors (see below), whose sum is σ = 93081960. Its totient is φ = 20224512.

The previous prime is 51136721. The next prime is 51136739. The reversal of 51136730 is 3763115.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (51136721) and next prime (51136739).

It can be written as a sum of positive squares in 4 ways, for example, as 39075001 + 12061729 = 6251^2 + 3473^2 .

It is a super-2 number, since 2×51136730² = 5229930310185800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51136730.

It is not an unprimeable number, because it can be changed into a prime (51136739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27839 + ... + 29618.

Almost surely, 2^51136730 is an apocalyptic number.

51136730 is a deficient number, since it is larger than the sum of its proper divisors (41945230).

51136730 is a wasteful number, since it uses less digits than its factorization.

51136730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57553.

The product of its (nonzero) digits is 1890, while the sum is 26.

The square root of 51136730 is about 7150.9950356576. The cubic root of 51136730 is about 371.1740887844.

Adding to 51136730 its reverse (3763115), we get a palindrome (54899845).

The spelling of 51136730 in words is "fifty-one million, one hundred thirty-six thousand, seven hundred thirty".