51059947 has 4 divisors (see below), whose sum is σ = 51272056. Its totient is φ = 50847840.

The previous prime is 51059917. The next prime is 51059971. The reversal of 51059947 is 74995015.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51059947 is a prime.

It is a super-3 number, since 3×51059947³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51059917) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105693 + ... + 106174.

It is an arithmetic number, because the mean of its divisors is an integer number (12818014).

Almost surely, 2^51059947 is an apocalyptic number.

51059947 is a deficient number, since it is larger than the sum of its proper divisors (212109).

51059947 is a wasteful number, since it uses less digits than its factorization.

51059947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212108.

The product of its (nonzero) digits is 56700, while the sum is 40.

The square root of 51059947 is about 7145.6243254176. The cubic root of 51059947 is about 370.9882201901.

The spelling of 51059947 in words is "fifty-one million, fifty-nine thousand, nine hundred forty-seven".