51205147 has 6 divisors (see below), whose sum is σ = 59565228. Its totient is φ = 43890084.

The previous prime is 51205127. The next prime is 51205163. The reversal of 51205147 is 74150215.

It is not a de Polignac number, because 51205147 - 2¹⁵ = 51172379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51205117) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 522453 + ... + 522550.

It is an arithmetic number, because the mean of its divisors is an integer number (9927538).

Almost surely, 2^51205147 is an apocalyptic number.

51205147 is a deficient number, since it is larger than the sum of its proper divisors (8360081).

51205147 is a wasteful number, since it uses less digits than its factorization.

51205147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1045017 (or 1045010 counting only the distinct ones).

The product of its (nonzero) digits is 1400, while the sum is 25.

The square root of 51205147 is about 7155.7771765197. Note that the first 3 decimals coincide. The cubic root of 51205147 is about 371.3395491147.

The spelling of 51205147 in words is "fifty-one million, two hundred five thousand, one hundred forty-seven".