51605237 has 2 divisors, whose sum is σ = 51605238. Its totient is φ = 51605236.

The previous prime is 51605231. The next prime is 51605291. The reversal of 51605237 is 73250615.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36168196 + 15437041 = 6014^2 + 3929^2 .

It is a cyclic number.

It is not a de Polignac number, because 51605237 - 2⁴ = 51605221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51605231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25802618 + 25802619.

It is an arithmetic number, because the mean of its divisors is an integer number (25802619).

Almost surely, 2^51605237 is an apocalyptic number.

It is an amenable number.

51605237 is a deficient number, since it is larger than the sum of its proper divisors (1).

51605237 is an equidigital number, since it uses as much as digits as its factorization.

51605237 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6300, while the sum is 29.

The square root of 51605237 is about 7183.6785145217. The cubic root of 51605237 is about 372.3041914904.

The spelling of 51605237 in words is "fifty-one million, six hundred five thousand, two hundred thirty-seven".