63700991 has 2 divisors, whose sum is σ = 63700992. Its totient is φ = 63700990.

The previous prime is 63700979. The next prime is 63700993. The reversal of 63700991 is 19900736.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 63700991 - 2¹⁰ = 63699967 is a prime.

Together with 63700993, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_3768344 and since 63700991 and 3768344 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63700993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31850495 + 31850496.

It is an arithmetic number, because the mean of its divisors is an integer number (31850496).

Almost surely, 2^63700991 is an apocalyptic number.

63700991 is a deficient number, since it is larger than the sum of its proper divisors (1).

63700991 is an equidigital number, since it uses as much as digits as its factorization.

63700991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10206, while the sum is 35.

The square root of 63700991 is about 7981.2900586309. The cubic root of 63700991 is about 399.3760919361.

The spelling of 63700991 in words is "sixty-three million, seven hundred thousand, nine hundred ninety-one".