51556706 has 4 divisors (see below), whose sum is σ = 77335062. Its totient is φ = 25778352.

The previous prime is 51556667. The next prime is 51556717. The reversal of 51556706 is 60765515.

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., 46308025 + 5248681 = 6805^2 + 2291^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 12889175 + ... + 12889178.

Almost surely, 2^51556706 is an apocalyptic number.

51556706 is a deficient number, since it is larger than the sum of its proper divisors (25778356).

51556706 is a wasteful number, since it uses less digits than its factorization.

51556706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25778355.

The product of its (nonzero) digits is 31500, while the sum is 35.

The square root of 51556706 is about 7180.2998544629. The cubic root of 51556706 is about 372.1874464809.

The spelling of 51556706 in words is "fifty-one million, five hundred fifty-six thousand, seven hundred six".