61943729 has 2 divisors, whose sum is σ = 61943730. Its totient is φ = 61943728.

The previous prime is 61943701. The next prime is 61943753. The reversal of 61943729 is 92734916.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37540129 + 24403600 = 6127^2 + 4940^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61943729 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (61943759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30971864 + 30971865.

It is an arithmetic number, because the mean of its divisors is an integer number (30971865).

Almost surely, 2^61943729 is an apocalyptic number.

It is an amenable number.

61943729 is a deficient number, since it is larger than the sum of its proper divisors (1).

61943729 is an equidigital number, since it uses as much as digits as its factorization.

61943729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81648, while the sum is 41.

The square root of 61943729 is about 7870.4338508115. The cubic root of 61943729 is about 395.6693857363.

The spelling of 61943729 in words is "sixty-one million, nine hundred forty-three thousand, seven hundred twenty-nine".