63121273 has 2 divisors, whose sum is σ = 63121274. Its totient is φ = 63121272.

The previous prime is 63121271. The next prime is 63121277. The reversal of 63121273 is 37212136.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61591104 + 1530169 = 7848^2 + 1237^2 .

It is a cyclic number.

It is not a de Polignac number, because 63121273 - 2¹ = 63121271 is a prime.

Together with 63121271, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (63121271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31560636 + 31560637.

It is an arithmetic number, because the mean of its divisors is an integer number (31560637).

Almost surely, 2^63121273 is an apocalyptic number.

It is an amenable number.

63121273 is a deficient number, since it is larger than the sum of its proper divisors (1).

63121273 is an equidigital number, since it uses as much as digits as its factorization.

63121273 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1512, while the sum is 25.

The square root of 63121273 is about 7944.8897412110. The cubic root of 63121273 is about 398.1608757647.

It can be divided in two parts, 631 and 21273, that added together give a square (21904 = 148²).

The spelling of 63121273 in words is "sixty-three million, one hundred twenty-one thousand, two hundred seventy-three".