51486221 has 2 divisors, whose sum is σ = 51486222. Its totient is φ = 51486220.

The previous prime is 51486199. The next prime is 51486229. The reversal of 51486221 is 12268415.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51337225 + 148996 = 7165^2 + 386^2 .

It is a cyclic number.

It is not a de Polignac number, because 51486221 - 2⁶ = 51486157 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51486229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25743110 + 25743111.

It is an arithmetic number, because the mean of its divisors is an integer number (25743111).

Almost surely, 2^51486221 is an apocalyptic number.

It is an amenable number.

51486221 is a deficient number, since it is larger than the sum of its proper divisors (1).

51486221 is an equidigital number, since it uses as much as digits as its factorization.

51486221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3840, while the sum is 29.

The square root of 51486221 is about 7175.3899545600. The cubic root of 51486221 is about 372.0177589125.

The spelling of 51486221 in words is "fifty-one million, four hundred eighty-six thousand, two hundred twenty-one".