51430947 has 4 divisors (see below), whose sum is σ = 68574600. Its totient is φ = 34287296.

The previous prime is 51430943. The next prime is 51430961. The reversal of 51430947 is 74903415.

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

It is a cyclic number.

It is not a de Polignac number, because 51430947 - 2² = 51430943 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51430943) 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, 8571822 + ... + 8571827.

It is an arithmetic number, because the mean of its divisors is an integer number (17143650).

Almost surely, 2^51430947 is an apocalyptic number.

51430947 is a deficient number, since it is larger than the sum of its proper divisors (17143653).

51430947 is a wasteful number, since it uses less digits than its factorization.

51430947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17143652.

The product of its (nonzero) digits is 15120, while the sum is 33.

The square root of 51430947 is about 7171.5372828983. The cubic root of 51430947 is about 371.8845823579.

The spelling of 51430947 in words is "fifty-one million, four hundred thirty thousand, nine hundred forty-seven".