63749869 has 2 divisors, whose sum is σ = 63749870. Its totient is φ = 63749868.

The previous prime is 63749867. The next prime is 63749909. The reversal of 63749869 is 96894736.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36844900 + 26904969 = 6070^2 + 5187^2 .

It is a cyclic number.

It is not a de Polignac number, because 63749869 - 2¹ = 63749867 is a prime.

It is a super-4 number, since 4×63749869⁴ (a number of 32 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

Together with 63749867, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63749867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31874934 + 31874935.

It is an arithmetic number, because the mean of its divisors is an integer number (31874935).

Almost surely, 2^63749869 is an apocalyptic number.

It is an amenable number.

63749869 is a deficient number, since it is larger than the sum of its proper divisors (1).

63749869 is an equidigital number, since it uses as much as digits as its factorization.

63749869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1959552, while the sum is 52.

The square root of 63749869 is about 7984.3515077932. The cubic root of 63749869 is about 399.4782133928.

The spelling of 63749869 in words is "sixty-three million, seven hundred forty-nine thousand, eight hundred sixty-nine".