61561171 has 8 divisors (see below), whose sum is σ = 72781920. Its totient is φ = 50947008.

The previous prime is 61561169. The next prime is 61561187. The reversal of 61561171 is 17116516.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 61561171 - 2¹ = 61561169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61561151) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 151426 + ... + 151831.

It is an arithmetic number, because the mean of its divisors is an integer number (9097740).

Almost surely, 2^61561171 is an apocalyptic number.

61561171 is a deficient number, since it is larger than the sum of its proper divisors (11220749).

61561171 is a wasteful number, since it uses less digits than its factorization.

61561171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303293.

The product of its digits is 1260, while the sum is 28.

The square root of 61561171 is about 7846.0927218584. The cubic root of 61561171 is about 394.8531655272.

Adding to 61561171 its reverse (17116516), we get a palindrome (78677687).

The spelling of 61561171 in words is "sixty-one million, five hundred sixty-one thousand, one hundred seventy-one".