63406813 has 2 divisors, whose sum is σ = 63406814. Its totient is φ = 63406812.

The previous prime is 63406793. The next prime is 63406831. The reversal of 63406813 is 31860436.

Together with next prime (63406831) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63154809 + 252004 = 7947^2 + 502^2 .

It is a cyclic number.

It is not a de Polignac number, because 63406813 - 2¹⁷ = 63275741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63466813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31703406 + 31703407.

It is an arithmetic number, because the mean of its divisors is an integer number (31703407).

Almost surely, 2^63406813 is an apocalyptic number.

It is an amenable number.

63406813 is a deficient number, since it is larger than the sum of its proper divisors (1).

63406813 is an equidigital number, since it uses as much as digits as its factorization.

63406813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 63406813 is about 7962.8395061058. The cubic root of 63406813 is about 398.7603559251.

The spelling of 63406813 in words is "sixty-three million, four hundred six thousand, eight hundred thirteen".