51340521 has 4 divisors (see below), whose sum is σ = 68454032. Its totient is φ = 34227012.

The previous prime is 51340519. The next prime is 51340537. The reversal of 51340521 is 12504315.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 51340521 - 2¹ = 51340519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51340501) 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, 8556751 + ... + 8556756.

It is an arithmetic number, because the mean of its divisors is an integer number (17113508).

Almost surely, 2^51340521 is an apocalyptic number.

It is an amenable number.

51340521 is a deficient number, since it is larger than the sum of its proper divisors (17113511).

51340521 is a wasteful number, since it uses less digits than its factorization.

51340521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17113510.

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 51340521 is about 7165.2300032867. The cubic root of 51340521 is about 371.6665050797. Note that the first 3 decimals are identical.

Adding to 51340521 its reverse (12504315), we get a palindrome (63844836).

The spelling of 51340521 in words is "fifty-one million, three hundred forty thousand, five hundred twenty-one".