61144439 has 2 divisors, whose sum is σ = 61144440. Its totient is φ = 61144438.

The previous prime is 61144429. The next prime is 61144459. The reversal of 61144439 is 93444116.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61144439 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61144429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30572219 + 30572220.

It is an arithmetic number, because the mean of its divisors is an integer number (30572220).

Almost surely, 2^61144439 is an apocalyptic number.

61144439 is a deficient number, since it is larger than the sum of its proper divisors (1).

61144439 is an equidigital number, since it uses as much as digits as its factorization.

61144439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10368, while the sum is 32.

The square root of 61144439 is about 7819.4909680874. The cubic root of 61144439 is about 393.9601748850.

The spelling of 61144439 in words is "sixty-one million, one hundred forty-four thousand, four hundred thirty-nine".