51072201 has 10 divisors (see below), whose sum is σ = 76293162. Its totient is φ = 34048080.

The previous prime is 51072193. The next prime is 51072211. The reversal of 51072201 is 10227015.

It can be written as a sum of positive squares in only one way, i.e., 35390601 + 15681600 = 5949^2 + 3960^2 .

It is not a de Polignac number, because 51072201 - 2³ = 51072193 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51072211) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 315180 + ... + 315341.

Almost surely, 2^51072201 is an apocalyptic number.

It is an amenable number.

51072201 is a deficient number, since it is larger than the sum of its proper divisors (25220961).

51072201 is an equidigital number, since it uses as much as digits as its factorization.

51072201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 630533 (or 630524 counting only the distinct ones).

The product of its (nonzero) digits is 140, while the sum is 18.

The square root of 51072201 is about 7146.4817217985. The cubic root of 51072201 is about 371.0178959359.

Adding to 51072201 its reverse (10227015), we get a palindrome (61299216).

The spelling of 51072201 in words is "fifty-one million, seventy-two thousand, two hundred one".