61085569 has 4 divisors (see below), whose sum is σ = 61101360. Its totient is φ = 61069780.

The previous prime is 61085567. The next prime is 61085579. The reversal of 61085569 is 96558016.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 61085569 - 2¹ = 61085567 is a prime.

It is a super-2 number, since 2×61085569² = 7462893480107522, which contains 22 as substring.

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 (61085561) 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, 2274 + ... + 11284.

It is an arithmetic number, because the mean of its divisors is an integer number (15275340).

Almost surely, 2^61085569 is an apocalyptic number.

It is an amenable number.

61085569 is a deficient number, since it is larger than the sum of its proper divisors (15791).

61085569 is an equidigital number, since it uses as much as digits as its factorization.

61085569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15790.

The product of its (nonzero) digits is 64800, while the sum is 40.

The square root of 61085569 is about 7815.7257500503. The cubic root of 61085569 is about 393.8336990458.

The spelling of 61085569 in words is "sixty-one million, eighty-five thousand, five hundred sixty-nine".