61381189 has 4 divisors (see below), whose sum is σ = 62387500. Its totient is φ = 60374880.

The previous prime is 61381171. The next prime is 61381193. The reversal of 61381189 is 98118316.

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 10144225 + 51236964 = 3185^2 + 7158^2 .

It is a cyclic number.

It is not a de Polignac number, because 61381189 - 2⁵ = 61381157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61381129) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 503064 + ... + 503185.

It is an arithmetic number, because the mean of its divisors is an integer number (15596875).

Almost surely, 2^61381189 is an apocalyptic number.

It is an amenable number.

61381189 is a deficient number, since it is larger than the sum of its proper divisors (1006311).

61381189 is a wasteful number, since it uses less digits than its factorization.

61381189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1006310.

The product of its digits is 10368, while the sum is 37.

The square root of 61381189 is about 7834.6147958914. The cubic root of 61381189 is about 394.4679885760.

The spelling of 61381189 in words is "sixty-one million, three hundred eighty-one thousand, one hundred eighty-nine".