51746221 has 2 divisors, whose sum is σ = 51746222. Its totient is φ = 51746220.

The previous prime is 51746213. The next prime is 51746231. The reversal of 51746221 is 12264715.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49154121 + 2592100 = 7011^2 + 1610^2 .

It is a cyclic number.

It is not a de Polignac number, because 51746221 - 2³ = 51746213 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51746221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51746231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25873110 + 25873111.

It is an arithmetic number, because the mean of its divisors is an integer number (25873111).

Almost surely, 2^51746221 is an apocalyptic number.

It is an amenable number.

51746221 is a deficient number, since it is larger than the sum of its proper divisors (1).

51746221 is an equidigital number, since it uses as much as digits as its factorization.

51746221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3360, while the sum is 28.

The square root of 51746221 is about 7193.4846215169. The cubic root of 51746221 is about 372.6429245996.

The spelling of 51746221 in words is "fifty-one million, seven hundred forty-six thousand, two hundred twenty-one".