61161389 has 4 divisors (see below), whose sum is σ = 61188924. Its totient is φ = 61133856.

The previous prime is 61161383. The next prime is 61161403. The reversal of 61161389 is 98316116.

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 40386025 + 20775364 = 6355^2 + 4558^2 .

It is a cyclic number.

It is not a de Polignac number, because 61161389 - 2²⁴ = 44384173 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 (61161383) 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, 10112 + ... + 14985.

It is an arithmetic number, because the mean of its divisors is an integer number (15297231).

Almost surely, 2^61161389 is an apocalyptic number.

It is an amenable number.

61161389 is a deficient number, since it is larger than the sum of its proper divisors (27535).

61161389 is a wasteful number, since it uses less digits than its factorization.

61161389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27534.

The product of its digits is 7776, while the sum is 35.

The square root of 61161389 is about 7820.5747231262. The cubic root of 61161389 is about 393.9965750774.

The spelling of 61161389 in words is "sixty-one million, one hundred sixty-one thousand, three hundred eighty-nine".