61188089 has 4 divisors (see below), whose sum is σ = 62026356. Its totient is φ = 60349824.

The previous prime is 61188067. The next prime is 61188091. The reversal of 61188089 is 98088116.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 50410000 + 10778089 = 7100^2 + 3283^2 .

It is a cyclic number.

It is not a de Polignac number, because 61188089 - 2¹⁶ = 61122553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61188989) 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 in 3 ways as a sum of consecutive naturals, for example, 419024 + ... + 419169.

It is an arithmetic number, because the mean of its divisors is an integer number (15506589).

Almost surely, 2^61188089 is an apocalyptic number.

It is an amenable number.

61188089 is a deficient number, since it is larger than the sum of its proper divisors (838267).

61188089 is an equidigital number, since it uses as much as digits as its factorization.

61188089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 838266.

The product of its (nonzero) digits is 27648, while the sum is 41.

The square root of 61188089 is about 7822.2815725337. The cubic root of 61188089 is about 394.0538997954.

The spelling of 61188089 in words is "sixty-one million, one hundred eighty-eight thousand, eighty-nine".