61609619 has 2 divisors, whose sum is σ = 61609620. Its totient is φ = 61609618.

The previous prime is 61609589. The next prime is 61609633. The reversal of 61609619 is 91690616.

61609619 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61609619 - 2⁸ = 61609363 is a prime.

It is a super-2 number, since 2×61609619² = 7591490306650322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (61600619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30804809 + 30804810.

It is an arithmetic number, because the mean of its divisors is an integer number (30804810).

Almost surely, 2^61609619 is an apocalyptic number.

61609619 is a deficient number, since it is larger than the sum of its proper divisors (1).

61609619 is an equidigital number, since it uses as much as digits as its factorization.

61609619 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17496, while the sum is 38.

The square root of 61609619 is about 7849.1795112610. The cubic root of 61609619 is about 394.9567201419.

The spelling of 61609619 in words is "sixty-one million, six hundred nine thousand, six hundred nineteen".