61323565 has 4 divisors (see below), whose sum is σ = 73588284. Its totient is φ = 49058848.

The previous prime is 61323523. The next prime is 61323593. The reversal of 61323565 is 56532316.

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 29095236 + 32228329 = 5394^2 + 5677^2 .

It is a cyclic number.

It is not a de Polignac number, because 61323565 - 2¹¹ = 61321517 is a prime.

It is a Smith number, since the sum of its digits (31) 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 a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6132352 + ... + 6132361.

It is an arithmetic number, because the mean of its divisors is an integer number (18397071).

Almost surely, 2^61323565 is an apocalyptic number.

It is an amenable number.

61323565 is a deficient number, since it is larger than the sum of its proper divisors (12264719).

61323565 is a wasteful number, since it uses less digits than its factorization.

61323565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12264718.

The product of its digits is 16200, while the sum is 31.

The square root of 61323565 is about 7830.9364063310. The cubic root of 61323565 is about 394.3445091594.

The spelling of 61323565 in words is "sixty-one million, three hundred twenty-three thousand, five hundred sixty-five".