63401881 has 2 divisors, whose sum is σ = 63401882. Its totient is φ = 63401880.

The previous prime is 63401843. The next prime is 63401893. The reversal of 63401881 is 18810436.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56025225 + 7376656 = 7485^2 + 2716^2 .

It is a cyclic number.

It is not a de Polignac number, because 63401881 - 2²⁵ = 29847449 is a prime.

It is a super-2 number, since 2×63401881² = 8039597028676322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (63401581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31700940 + 31700941.

It is an arithmetic number, because the mean of its divisors is an integer number (31700941).

Almost surely, 2^63401881 is an apocalyptic number.

It is an amenable number.

63401881 is a deficient number, since it is larger than the sum of its proper divisors (1).

63401881 is an equidigital number, since it uses as much as digits as its factorization.

63401881 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 63401881 is about 7962.5298115611. The cubic root of 63401881 is about 398.7500166731.

The spelling of 63401881 in words is "sixty-three million, four hundred one thousand, eight hundred eighty-one".