63691879 has 2 divisors, whose sum is σ = 63691880. Its totient is φ = 63691878.

The previous prime is 63691847. The next prime is 63691883. The reversal of 63691879 is 97819636.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 63691879 - 2⁵ = 63691847 is a prime.

It is a super-3 number, since 3×63691879³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63691829) 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, 31845939 + 31845940.

It is an arithmetic number, because the mean of its divisors is an integer number (31845940).

Almost surely, 2^63691879 is an apocalyptic number.

63691879 is a deficient number, since it is larger than the sum of its proper divisors (1).

63691879 is an equidigital number, since it uses as much as digits as its factorization.

63691879 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 489888, while the sum is 49.

The square root of 63691879 is about 7980.7192031796. The cubic root of 63691879 is about 399.3570483366.

The spelling of 63691879 in words is "sixty-three million, six hundred ninety-one thousand, eight hundred seventy-nine".