51047945 has 8 divisors (see below), whose sum is σ = 65969736. Its totient is φ = 37696896.

The previous prime is 51047929. The next prime is 51047959. The reversal of 51047945 is 54974015.

It can be written as a sum of positive squares in 4 ways, for example, as 808201 + 50239744 = 899^2 + 7088^2 .

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 51047945 - 2⁴ = 51047929 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, 392612 + ... + 392741.

It is an arithmetic number, because the mean of its divisors is an integer number (8246217).

Almost surely, 2^51047945 is an apocalyptic number.

It is an amenable number.

51047945 is a deficient number, since it is larger than the sum of its proper divisors (14921791).

51047945 is a wasteful number, since it uses less digits than its factorization.

51047945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 785371.

The product of its (nonzero) digits is 25200, while the sum is 35.

The square root of 51047945 is about 7144.7844614096. The cubic root of 51047945 is about 370.9591501146.

The spelling of 51047945 in words is "fifty-one million, forty-seven thousand, nine hundred forty-five".