61615189 has 2 divisors, whose sum is σ = 61615190. Its totient is φ = 61615188.

The previous prime is 61615187. The next prime is 61615217. The reversal of 61615189 is 98151616.

61615189 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50339025 + 11276164 = 7095^2 + 3358^2 .

It is a cyclic number.

It is not a de Polignac number, because 61615189 - 2¹ = 61615187 is a prime.

Together with 61615187, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61615187) 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, 30807594 + 30807595.

It is an arithmetic number, because the mean of its divisors is an integer number (30807595).

Almost surely, 2^61615189 is an apocalyptic number.

It is an amenable number.

61615189 is a deficient number, since it is larger than the sum of its proper divisors (1).

61615189 is an equidigital number, since it uses as much as digits as its factorization.

61615189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12960, while the sum is 37.

The square root of 61615189 is about 7849.5343173974. The cubic root of 61615189 is about 394.9686221937.

The spelling of 61615189 in words is "sixty-one million, six hundred fifteen thousand, one hundred eighty-nine".