51501253 has 2 divisors, whose sum is σ = 51501254. Its totient is φ = 51501252.

The previous prime is 51501239. The next prime is 51501257. The reversal of 51501253 is 35210515.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38526849 + 12974404 = 6207^2 + 3602^2 .

It is a cyclic number.

It is not a de Polignac number, because 51501253 - 2⁵ = 51501221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51501257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25750626 + 25750627.

It is an arithmetic number, because the mean of its divisors is an integer number (25750627).

Almost surely, 2^51501253 is an apocalyptic number.

It is an amenable number.

51501253 is a deficient number, since it is larger than the sum of its proper divisors (1).

51501253 is an equidigital number, since it uses as much as digits as its factorization.

51501253 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 750, while the sum is 22.

The square root of 51501253 is about 7176.4373473194. The cubic root of 51501253 is about 372.0539603576.

Adding to 51501253 its reverse (35210515), we get a palindrome (86711768).

The spelling of 51501253 in words is "fifty-one million, five hundred one thousand, two hundred fifty-three".