51201530 has 16 divisors (see below), whose sum is σ = 95341320. Its totient is φ = 19774272.

The previous prime is 51201503. The next prime is 51201539. The reversal of 51201530 is 3510215.

It can be written as a sum of positive squares in 4 ways, for example, as 32478601 + 18722929 = 5699^2 + 4327^2 .

It is a junction number, because it is equal to n+sod(n) for n = 51201499 and 51201508.

It is not an unprimeable number, because it can be changed into a prime (51201539) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 87989 + ... + 88568.

Almost surely, 2^51201530 is an apocalyptic number.

51201530 is a deficient number, since it is larger than the sum of its proper divisors (44139790).

51201530 is a wasteful number, since it uses less digits than its factorization.

51201530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176593.

The product of its (nonzero) digits is 150, while the sum is 17.

The square root of 51201530 is about 7155.5244392008. The cubic root of 51201530 is about 371.3308054183.

Adding to 51201530 its reverse (3510215), we get a palindrome (54711745).

The spelling of 51201530 in words is "fifty-one million, two hundred one thousand, five hundred thirty".