61643383 has 2 divisors, whose sum is σ = 61643384. Its totient is φ = 61643382.

The previous prime is 61643371. The next prime is 61643401. The reversal of 61643383 is 38334616.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61643383 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61643333) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30821691 + 30821692.

It is an arithmetic number, because the mean of its divisors is an integer number (30821692).

Almost surely, 2^61643383 is an apocalyptic number.

61643383 is a deficient number, since it is larger than the sum of its proper divisors (1).

61643383 is an equidigital number, since it uses as much as digits as its factorization.

61643383 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31104, while the sum is 34.

The square root of 61643383 is about 7851.3300147173. The cubic root of 61643383 is about 395.0288565149.

Adding to 61643383 its reverse (38334616), we get a palindrome (99977999).

It can be divided in two parts, 61643 and 383, that added together give a palindrome (62026).

The spelling of 61643383 in words is "sixty-one million, six hundred forty-three thousand, three hundred eighty-three".