61005739 has 2 divisors, whose sum is σ = 61005740. Its totient is φ = 61005738.

The previous prime is 61005733. The next prime is 61005761. The reversal of 61005739 is 93750016.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61005739 - 2³ = 61005731 is a prime.

It is a super-2 number, since 2×61005739² = 7443400381872242, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 61005739.

It is not a weakly prime, because it can be changed into another prime (61005731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30502869 + 30502870.

It is an arithmetic number, because the mean of its divisors is an integer number (30502870).

Almost surely, 2^61005739 is an apocalyptic number.

61005739 is a deficient number, since it is larger than the sum of its proper divisors (1).

61005739 is an equidigital number, since it uses as much as digits as its factorization.

61005739 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5670, while the sum is 31.

The square root of 61005739 is about 7810.6170690926. The cubic root of 61005739 is about 393.6620630364.

The spelling of 61005739 in words is "sixty-one million, five thousand, seven hundred thirty-nine".