51530146 has 4 divisors (see below), whose sum is σ = 77295222. Its totient is φ = 25765072.

The previous prime is 51530137. The next prime is 51530161. The reversal of 51530146 is 64103515.

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

It can be written as a sum of positive squares in only one way, i.e., 40896025 + 10634121 = 6395^2 + 3261^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 51530146.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12882535 + ... + 12882538.

Almost surely, 2^51530146 is an apocalyptic number.

51530146 is a deficient number, since it is larger than the sum of its proper divisors (25765076).

51530146 is a wasteful number, since it uses less digits than its factorization.

51530146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25765075.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 51530146 is about 7178.4501112705. The cubic root of 51530146 is about 372.1235233605.

The spelling of 51530146 in words is "fifty-one million, five hundred thirty thousand, one hundred forty-six".