51960221 has 2 divisors, whose sum is σ = 51960222. Its totient is φ = 51960220.

The previous prime is 51960149. The next prime is 51960229. The reversal of 51960221 is 12206915.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49857721 + 2102500 = 7061^2 + 1450^2 .

It is a cyclic number.

It is not a de Polignac number, because 51960221 - 2¹⁸ = 51698077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51960229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25980110 + 25980111.

It is an arithmetic number, because the mean of its divisors is an integer number (25980111).

Almost surely, 2^51960221 is an apocalyptic number.

It is an amenable number.

51960221 is a deficient number, since it is larger than the sum of its proper divisors (1).

51960221 is an equidigital number, since it uses as much as digits as its factorization.

51960221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 51960221 is about 7208.3438458498. The cubic root of 51960221 is about 373.1559147601.

The spelling of 51960221 in words is "fifty-one million, nine hundred sixty thousand, two hundred twenty-one".