51225501 has 32 divisors (see below), whose sum is σ = 74856960. Its totient is φ = 31046976.

The previous prime is 51225491. The next prime is 51225509. The reversal of 51225501 is 10552215.

It is not a de Polignac number, because 51225501 - 2⁵ = 51225469 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51225509) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 225550 + ... + 225776.

It is an arithmetic number, because the mean of its divisors is an integer number (2339280).

Almost surely, 2^51225501 is an apocalyptic number.

It is an amenable number.

51225501 is a deficient number, since it is larger than the sum of its proper divisors (23631459).

51225501 is a wasteful number, since it uses less digits than its factorization.

51225501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 393.

The product of its (nonzero) digits is 500, while the sum is 21.

The square root of 51225501 is about 7157.1992427206. The cubic root of 51225501 is about 371.3887449760.

Adding to 51225501 its reverse (10552215), we get a palindrome (61777716).

The spelling of 51225501 in words is "fifty-one million, two hundred twenty-five thousand, five hundred one".