51202251 has 6 divisors (see below), whose sum is σ = 73958820. Its totient is φ = 34134828.

The previous prime is 51202247. The next prime is 51202259. The reversal of 51202251 is 15220215.

It is not a de Polignac number, because 51202251 - 2² = 51202247 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51202259) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2844561 + ... + 2844578.

It is an arithmetic number, because the mean of its divisors is an integer number (12326470).

Almost surely, 2^51202251 is an apocalyptic number.

51202251 is a deficient number, since it is larger than the sum of its proper divisors (22756569).

51202251 is a wasteful number, since it uses less digits than its factorization.

51202251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5689145 (or 5689142 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 51202251 is about 7155.5748196773. The cubic root of 51202251 is about 371.3325483887.

Adding to 51202251 its reverse (15220215), we get a palindrome (66422466).

The spelling of 51202251 in words is "fifty-one million, two hundred two thousand, two hundred fifty-one".