61271365 has 4 divisors (see below), whose sum is σ = 73525644. Its totient is φ = 49017088.

The previous prime is 61271351. The next prime is 61271369. The reversal of 61271365 is 56317216.

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 11512449 + 49758916 = 3393^2 + 7054^2 .

It is a cyclic number.

It is not a de Polignac number, because 61271365 - 2¹³ = 61263173 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 not an unprimeable number, because it can be changed into a prime (61271369) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6127132 + ... + 6127141.

It is an arithmetic number, because the mean of its divisors is an integer number (18381411).

Almost surely, 2^61271365 is an apocalyptic number.

It is an amenable number.

61271365 is a deficient number, since it is larger than the sum of its proper divisors (12254279).

61271365 is a wasteful number, since it uses less digits than its factorization.

61271365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12254278.

The product of its digits is 7560, while the sum is 31.

The square root of 61271365 is about 7827.6027620211. The cubic root of 61271365 is about 394.2325857529.

The spelling of 61271365 in words is "sixty-one million, two hundred seventy-one thousand, three hundred sixty-five".