63969361 has 4 divisors (see below), whose sum is σ = 64028772. Its totient is φ = 63909952.

The previous prime is 63969359. The next prime is 63969379. The reversal of 63969361 is 16396936.

63969361 = 5655² + 5656².

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 31990336 + 31979025 = 5656^2 + 5655^2 .

It is a cyclic number.

It is not a de Polignac number, because 63969361 - 2¹ = 63969359 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63969161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28060 + ... + 30253.

It is an arithmetic number, because the mean of its divisors is an integer number (16007193).

Almost surely, 2^63969361 is an apocalyptic number.

63969361 is the 5656-th centered square number.

It is an amenable number.

63969361 is a deficient number, since it is larger than the sum of its proper divisors (59411).

63969361 is a wasteful number, since it uses less digits than its factorization.

63969361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59410.

The product of its digits is 157464, while the sum is 43.

The square root of 63969361 is about 7998.0848332585. The cubic root of 63969361 is about 399.9361585612.

The spelling of 63969361 in words is "sixty-three million, nine hundred sixty-nine thousand, three hundred sixty-one".