51605121 has 16 divisors (see below), whose sum is σ = 74388800. Its totient is φ = 31710528.

The previous prime is 51605063. The next prime is 51605131. The reversal of 51605121 is 12150615.

It is not a de Polignac number, because 51605121 - 2¹⁹ = 51080833 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51605131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10126 + ... + 14343.

It is an arithmetic number, because the mean of its divisors is an integer number (4649300).

Almost surely, 2^51605121 is an apocalyptic number.

It is an amenable number.

51605121 is a deficient number, since it is larger than the sum of its proper divisors (22783679).

51605121 is a wasteful number, since it uses less digits than its factorization.

51605121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24528.

The product of its (nonzero) digits is 300, while the sum is 21.

The square root of 51605121 is about 7183.6704406591. The cubic root of 51605121 is about 372.3039125309.

Adding to 51605121 its reverse (12150615), we get a palindrome (63755736).

The spelling of 51605121 in words is "fifty-one million, six hundred five thousand, one hundred twenty-one".