51045506 has 4 divisors (see below), whose sum is σ = 76568262. Its totient is φ = 25522752.

The previous prime is 51045503. The next prime is 51045517. The reversal of 51045506 is 60554015.

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., 25593481 + 25452025 = 5059^2 + 5045^2 .

It is not an unprimeable number, because it can be changed into a prime (51045503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12761375 + ... + 12761378.

Almost surely, 2^51045506 is an apocalyptic number.

51045506 is a deficient number, since it is larger than the sum of its proper divisors (25522756).

51045506 is a wasteful number, since it uses less digits than its factorization.

51045506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25522755.

The product of its (nonzero) digits is 3000, while the sum is 26.

The square root of 51045506 is about 7144.6137754255. The cubic root of 51045506 is about 370.9532420493.

The spelling of 51045506 in words is "fifty-one million, forty-five thousand, five hundred six".