61285769 has 4 divisors (see below), whose sum is σ = 61640196. Its totient is φ = 60931344.

The previous prime is 61285747. The next prime is 61285813. The reversal of 61285769 is 96758216.

61285769 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 23892544 + 37393225 = 4888^2 + 6115^2 .

It is a cyclic number.

It is not a de Polignac number, because 61285769 - 2⁸ = 61285513 is a prime.

It is a super-2 number, since 2×61285769² = 7511890963842722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (61285739) 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 in 3 ways as a sum of consecutive naturals, for example, 176954 + ... + 177299.

It is an arithmetic number, because the mean of its divisors is an integer number (15410049).

Almost surely, 2^61285769 is an apocalyptic number.

It is an amenable number.

61285769 is a deficient number, since it is larger than the sum of its proper divisors (354427).

61285769 is a wasteful number, since it uses less digits than its factorization.

61285769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 354426.

The product of its digits is 181440, while the sum is 44.

The square root of 61285769 is about 7828.5227853025. The cubic root of 61285769 is about 394.2634761002.

The spelling of 61285769 in words is "sixty-one million, two hundred eighty-five thousand, seven hundred sixty-nine".