51515201 has 4 divisors (see below), whose sum is σ = 52388400. Its totient is φ = 50642004.

The previous prime is 51515159. The next prime is 51515209. The reversal of 51515201 is 10251515.

It is a happy number.

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 a de Polignac number, because none of the positive numbers 2^k-51515201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51515209) 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, 436511 + ... + 436628.

It is an arithmetic number, because the mean of its divisors is an integer number (13097100).

Almost surely, 2^51515201 is an apocalyptic number.

It is an amenable number.

51515201 is a deficient number, since it is larger than the sum of its proper divisors (873199).

51515201 is an equidigital number, since it uses as much as digits as its factorization.

51515201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 873198.

The product of its (nonzero) digits is 250, while the sum is 20.

The square root of 51515201 is about 7177.4090729176. The cubic root of 51515201 is about 372.0875449141.

Adding to 51515201 its reverse (10251515), we get a palindrome (61766716).

The spelling of 51515201 in words is "fifty-one million, five hundred fifteen thousand, two hundred one".