61772171 has 2 divisors, whose sum is σ = 61772172. Its totient is φ = 61772170.

The previous prime is 61772167. The next prime is 61772197. The reversal of 61772171 is 17127716.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61772171 - 2² = 61772167 is a prime.

It is a super-2 number, since 2×61772171² = 7631602220106482, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (61772111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30886085 + 30886086.

It is an arithmetic number, because the mean of its divisors is an integer number (30886086).

Almost surely, 2^61772171 is an apocalyptic number.

61772171 is a deficient number, since it is larger than the sum of its proper divisors (1).

61772171 is an equidigital number, since it uses as much as digits as its factorization.

61772171 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4116, while the sum is 32.

The square root of 61772171 is about 7859.5274030949. The cubic root of 61772171 is about 395.3037688948.

Adding to 61772171 its reverse (17127716), we get a palindrome (78899887).

The spelling of 61772171 in words is "sixty-one million, seven hundred seventy-two thousand, one hundred seventy-one".