51742321 has 4 divisors (see below), whose sum is σ = 51968500. Its totient is φ = 51516144.

The previous prime is 51742319. The next prime is 51742331. The reversal of 51742321 is 12324715.

It is a happy number.

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 50253921 + 1488400 = 7089^2 + 1220^2 .

It is a cyclic number.

It is not a de Polignac number, because 51742321 - 2¹ = 51742319 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51742331) 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, 112746 + ... + 113203.

It is an arithmetic number, because the mean of its divisors is an integer number (12992125).

Almost surely, 2^51742321 is an apocalyptic number.

It is an amenable number.

51742321 is a deficient number, since it is larger than the sum of its proper divisors (226179).

51742321 is a wasteful number, since it uses less digits than its factorization.

51742321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226178.

The product of its digits is 1680, while the sum is 25.

The square root of 51742321 is about 7193.2135377729. The cubic root of 51742321 is about 372.6335626025.

The spelling of 51742321 in words is "fifty-one million, seven hundred forty-two thousand, three hundred twenty-one".