51362521 has 4 divisors (see below), whose sum is σ = 58700032. Its totient is φ = 44025012.

The previous prime is 51362513. The next prime is 51362537. The reversal of 51362521 is 12526315.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12526315 = 5 ⋅2505263.

It is a cyclic number.

It is not a de Polignac number, because 51362521 - 2³ = 51362513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51362501) 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, 3668745 + ... + 3668758.

It is an arithmetic number, because the mean of its divisors is an integer number (14675008).

Almost surely, 2^51362521 is an apocalyptic number.

It is an amenable number.

51362521 is a deficient number, since it is larger than the sum of its proper divisors (7337511).

51362521 is an equidigital number, since it uses as much as digits as its factorization.

51362521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7337510.

The product of its digits is 1800, while the sum is 25.

The square root of 51362521 is about 7166.7650303327. The cubic root of 51362521 is about 371.7195852803.

Adding to 51362521 its reverse (12526315), we get a palindrome (63888836).

The spelling of 51362521 in words is "fifty-one million, three hundred sixty-two thousand, five hundred twenty-one".