51405047 has 8 divisors (see below), whose sum is σ = 52204176. Its totient is φ = 50612032.

The previous prime is 51405017. The next prime is 51405049. The reversal of 51405047 is 74050415.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51405047 - 2¹⁴ = 51388663 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51405049) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17123 + ... + 19899.

It is an arithmetic number, because the mean of its divisors is an integer number (6525522).

Almost surely, 2^51405047 is an apocalyptic number.

51405047 is a deficient number, since it is larger than the sum of its proper divisors (799129).

51405047 is a wasteful number, since it uses less digits than its factorization.

51405047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3057.

The product of its (nonzero) digits is 2800, while the sum is 26.

The square root of 51405047 is about 7169.7313059835. The cubic root of 51405047 is about 371.8221463570.

The spelling of 51405047 in words is "fifty-one million, four hundred five thousand, forty-seven".