51047905 has 8 divisors (see below), whose sum is σ = 61996032. Its totient is φ = 40345968.

The previous prime is 51047891. The next prime is 51047929. The reversal of 51047905 is 50974015.

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

It is not a de Polignac number, because 51047905 - 2⁵ = 51047873 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61089 + ... + 61918.

It is an arithmetic number, because the mean of its divisors is an integer number (7749504).

Almost surely, 2^51047905 is an apocalyptic number.

It is an amenable number.

51047905 is a deficient number, since it is larger than the sum of its proper divisors (10948127).

51047905 is a wasteful number, since it uses less digits than its factorization.

51047905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123095.

The product of its (nonzero) digits is 6300, while the sum is 31.

The square root of 51047905 is about 7144.7816621644. The cubic root of 51047905 is about 370.9590532229.

The spelling of 51047905 in words is "fifty-one million, forty-seven thousand, nine hundred five".