51356530 has 8 divisors (see below), whose sum is σ = 92441772. Its totient is φ = 20542608.

The previous prime is 51356509. The next prime is 51356537. The reversal of 51356530 is 3565315.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 51308569 + 47961 = 7163^2 + 219^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (51356537) 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, 2567817 + ... + 2567836.

Almost surely, 2^51356530 is an apocalyptic number.

51356530 is a deficient number, since it is larger than the sum of its proper divisors (41085242).

51356530 is a wasteful number, since it uses less digits than its factorization.

51356530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5135660.

The product of its (nonzero) digits is 6750, while the sum is 28.

The square root of 51356530 is about 7166.3470471364. The cubic root of 51356530 is about 371.7051320786.

The spelling of 51356530 in words is "fifty-one million, three hundred fifty-six thousand, five hundred thirty".