61111271 has 4 divisors (see below), whose sum is σ = 65812152. Its totient is φ = 56410392.

The previous prime is 61111249. The next prime is 61111273. The reversal of 61111271 is 17211116.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61111271 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61111273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2350421 + ... + 2350446.

It is an arithmetic number, because the mean of its divisors is an integer number (16453038).

Almost surely, 2^61111271 is an apocalyptic number.

61111271 is a deficient number, since it is larger than the sum of its proper divisors (4700881).

61111271 is a wasteful number, since it uses less digits than its factorization.

61111271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4700880.

The product of its digits is 84, while the sum is 20.

The square root of 61111271 is about 7817.3698262267. The cubic root of 61111271 is about 393.8889270075. Note that the first 3 decimals are identical.

Adding to 61111271 its reverse (17211116), we get a palindrome (78322387).

The spelling of 61111271 in words is "sixty-one million, one hundred eleven thousand, two hundred seventy-one".