63691273 has 2 divisors, whose sum is σ = 63691274. Its totient is φ = 63691272.

The previous prime is 63691223. The next prime is 63691297. The reversal of 63691273 is 37219636.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57198969 + 6492304 = 7563^2 + 2548^2 .

It is a cyclic number.

It is not a de Polignac number, because 63691273 - 2⁹ = 63690761 is a prime.

It is not a weakly prime, because it can be changed into another prime (63691223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31845636 + 31845637.

It is an arithmetic number, because the mean of its divisors is an integer number (31845637).

Almost surely, 2^63691273 is an apocalyptic number.

It is an amenable number.

63691273 is a deficient number, since it is larger than the sum of its proper divisors (1).

63691273 is an equidigital number, since it uses as much as digits as its factorization.

63691273 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40824, while the sum is 37.

The square root of 63691273 is about 7980.6812365863. The cubic root of 63691273 is about 399.3557817642.

The spelling of 63691273 in words is "sixty-three million, six hundred ninety-one thousand, two hundred seventy-three".