61711161 has 4 divisors (see below), whose sum is σ = 82281552. Its totient is φ = 41140772.

The previous prime is 61711151. The next prime is 61711163. The reversal of 61711161 is 16111716.

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.

It is a cyclic number.

It is not a de Polignac number, because 61711161 - 2⁷ = 61711033 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (61711163) 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, 10285191 + ... + 10285196.

It is an arithmetic number, because the mean of its divisors is an integer number (20570388).

Almost surely, 2^61711161 is an apocalyptic number.

It is an amenable number.

61711161 is a deficient number, since it is larger than the sum of its proper divisors (20570391).

61711161 is a wasteful number, since it uses less digits than its factorization.

61711161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20570390.

The product of its digits is 252, while the sum is 24.

The square root of 61711161 is about 7855.6451676485. The cubic root of 61711161 is about 395.1735839109.

Adding to 61711161 its reverse (16111716), we get a palindrome (77822877).

The spelling of 61711161 in words is "sixty-one million, seven hundred eleven thousand, one hundred sixty-one".