51942745 has 4 divisors (see below), whose sum is σ = 62331300. Its totient is φ = 41554192.

The previous prime is 51942743. The next prime is 51942749. The reversal of 51942745 is 54724915.

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

It can be written as a sum of positive squares in 2 ways, for example, as 20403289 + 31539456 = 4517^2 + 5616^2 .

It is a cyclic number.

It is not a de Polignac number, because 51942745 - 2¹ = 51942743 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51942743) 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, 5194270 + ... + 5194279.

It is an arithmetic number, because the mean of its divisors is an integer number (15582825).

Almost surely, 2^51942745 is an apocalyptic number.

It is an amenable number.

51942745 is a deficient number, since it is larger than the sum of its proper divisors (10388555).

51942745 is a wasteful number, since it uses less digits than its factorization.

51942745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10388554.

The product of its digits is 50400, while the sum is 37.

The square root of 51942745 is about 7207.1315375814. The cubic root of 51942745 is about 373.1140750355.

It can be divided in two parts, 519 and 42745, that added together give a square (43264 = 208²).

The spelling of 51942745 in words is "fifty-one million, nine hundred forty-two thousand, seven hundred forty-five".