51599906 has 4 divisors (see below), whose sum is σ = 77399862. Its totient is φ = 25799952.

The previous prime is 51599893. The next prime is 51599917. The reversal of 51599906 is 60999515.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 60999515 = 5 ⋅12199903.

It can be written as a sum of positive squares in only one way, i.e., 47955625 + 3644281 = 6925^2 + 1909^2 .

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, 12899975 + ... + 12899978.

Almost surely, 2^51599906 is an apocalyptic number.

51599906 is a deficient number, since it is larger than the sum of its proper divisors (25799956).

51599906 is a wasteful number, since it uses less digits than its factorization.

51599906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25799955.

The product of its (nonzero) digits is 109350, while the sum is 44.

The square root of 51599906 is about 7183.3074554832. The cubic root of 51599906 is about 372.2913709441.

The spelling of 51599906 in words is "fifty-one million, five hundred ninety-nine thousand, nine hundred six".