51605201 has 4 divisors (see below), whose sum is σ = 52703232. Its totient is φ = 50507172.

The previous prime is 51605189. The next prime is 51605221. The reversal of 51605201 is 10250615.

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 a cyclic number.

It is not a de Polignac number, because 51605201 - 2¹⁸ = 51343057 is a prime.

It is a super-3 number, since 3×51605201³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (51605221) 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, 548945 + ... + 549038.

It is an arithmetic number, because the mean of its divisors is an integer number (13175808).

Almost surely, 2^51605201 is an apocalyptic number.

It is an amenable number.

51605201 is a deficient number, since it is larger than the sum of its proper divisors (1098031).

51605201 is a wasteful number, since it uses less digits than its factorization.

51605201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1098030.

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 51605201 is about 7183.6760088412. The cubic root of 51605201 is about 372.3041049168.

Adding to 51605201 its reverse (10250615), we get a palindrome (61855816).

The spelling of 51605201 in words is "fifty-one million, six hundred five thousand, two hundred one".