61605413 has 2 divisors, whose sum is σ = 61605414. Its totient is φ = 61605412.

The previous prime is 61605409. The next prime is 61605437. The reversal of 61605413 is 31450616.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59706529 + 1898884 = 7727^2 + 1378^2 .

It is a cyclic number.

It is not a de Polignac number, because 61605413 - 2² = 61605409 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61605403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30802706 + 30802707.

It is an arithmetic number, because the mean of its divisors is an integer number (30802707).

Almost surely, 2^61605413 is an apocalyptic number.

It is an amenable number.

61605413 is a deficient number, since it is larger than the sum of its proper divisors (1).

61605413 is an equidigital number, since it uses as much as digits as its factorization.

61605413 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 61605413 is about 7848.9115805951. The cubic root of 61605413 is about 394.9477322284.

The spelling of 61605413 in words is "sixty-one million, six hundred five thousand, four hundred thirteen".