61154689 has 4 divisors (see below), whose sum is σ = 61347924. Its totient is φ = 60961456.

The previous prime is 61154683. The next prime is 61154693. The reversal of 61154689 is 98645116.

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 35904064 + 25250625 = 5992^2 + 5025^2 .

It is a cyclic number.

It is not a de Polignac number, because 61154689 - 2²³ = 52766081 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61154683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 96142 + ... + 96775.

It is an arithmetic number, because the mean of its divisors is an integer number (15336981).

Almost surely, 2^61154689 is an apocalyptic number.

It is an amenable number.

61154689 is a deficient number, since it is larger than the sum of its proper divisors (193235).

61154689 is a wasteful number, since it uses less digits than its factorization.

61154689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193234.

The product of its digits is 51840, while the sum is 40.

The square root of 61154689 is about 7820.1463541292. The cubic root of 61154689 is about 393.9821876046.

The spelling of 61154689 in words is "sixty-one million, one hundred fifty-four thousand, six hundred eighty-nine".