51647245 has 12 divisors (see below), whose sum is σ = 67111956. Its totient is φ = 38138880.

The previous prime is 51647203. The next prime is 51647269. The reversal of 51647245 is 54274615.

It can be written as a sum of positive squares in 6 ways, for example, as 26275876 + 25371369 = 5126^2 + 5037^2 .

It is not a de Polignac number, because 51647245 - 2⁹ = 51646733 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51647245.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29716 + ... + 31405.

It is an arithmetic number, because the mean of its divisors is an integer number (5592663).

Almost surely, 2^51647245 is an apocalyptic number.

It is an amenable number.

51647245 is a deficient number, since it is larger than the sum of its proper divisors (15464711).

51647245 is a wasteful number, since it uses less digits than its factorization.

51647245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61152 (or 61139 counting only the distinct ones).

The product of its digits is 33600, while the sum is 34.

The square root of 51647245 is about 7186.6017699605. The cubic root of 51647245 is about 372.4051858441.

The spelling of 51647245 in words is "fifty-one million, six hundred forty-seven thousand, two hundred forty-five".