61605171 has 8 divisors (see below), whose sum is σ = 91266960. Its totient is φ = 41070096.

The previous prime is 61605169. The next prime is 61605199. The reversal of 61605171 is 17150616.

It is not a de Polignac number, because 61605171 - 2¹ = 61605169 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 2281673 = 61605171 / (6 + 1 + 6 + 0 + 5 + 1 + 7 + 1).

It is not an unprimeable number, because it can be changed into a prime (61605101) 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, 1140810 + ... + 1140863.

It is an arithmetic number, because the mean of its divisors is an integer number (11408370).

Almost surely, 2^61605171 is an apocalyptic number.

61605171 is a deficient number, since it is larger than the sum of its proper divisors (29661789).

61605171 is a wasteful number, since it uses less digits than its factorization.

61605171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2281682 (or 2281676 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 27.

The square root of 61605171 is about 7848.8961644297. The cubic root of 61605171 is about 394.9472150797.

Adding to 61605171 its reverse (17150616), we get a palindrome (78755787).

It can be divided in two parts, 61605 and 171, that added together give a triangular number (61776 = T₃₅₁).

The spelling of 61605171 in words is "sixty-one million, six hundred five thousand, one hundred seventy-one".