51530506 has 8 divisors (see below), whose sum is σ = 79961220. Its totient is φ = 24876768.

The previous prime is 51530473. The next prime is 51530533. The reversal of 51530506 is 60503515.

It can be written as a sum of positive squares in 2 ways, for example, as 44555625 + 6974881 = 6675^2 + 2641^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 444171 + ... + 444286.

Almost surely, 2^51530506 is an apocalyptic number.

51530506 is a deficient number, since it is larger than the sum of its proper divisors (28430714).

51530506 is a wasteful number, since it uses less digits than its factorization.

51530506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 888488.

The product of its (nonzero) digits is 2250, while the sum is 25.

The square root of 51530506 is about 7178.4751862774. The cubic root of 51530506 is about 372.1243899352.

The spelling of 51530506 in words is "fifty-one million, five hundred thirty thousand, five hundred six".