61171643 has 16 divisors (see below), whose sum is σ = 68560800. Its totient is φ = 54190080.

The previous prime is 61171637. The next prime is 61171657. The reversal of 61171643 is 34617116.

It is a cyclic number.

It is not a de Polignac number, because 61171643 - 2¹⁰ = 61170619 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61171633) 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 15 ways as a sum of consecutive naturals, for example, 79163 + ... + 79931.

It is an arithmetic number, because the mean of its divisors is an integer number (4285050).

Almost surely, 2^61171643 is an apocalyptic number.

61171643 is a deficient number, since it is larger than the sum of its proper divisors (7389157).

61171643 is a wasteful number, since it uses less digits than its factorization.

61171643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1022.

The product of its digits is 3024, while the sum is 29.

The square root of 61171643 is about 7821.2302740681. The cubic root of 61171643 is about 394.0185923184.

Adding to 61171643 its reverse (34617116), we get a palindrome (95788759).

The spelling of 61171643 in words is "sixty-one million, one hundred seventy-one thousand, six hundred forty-three".