61173945 has 24 divisors (see below), whose sum is σ = 121183296. Its totient is φ = 27965088.

The previous prime is 61173941. The next prime is 61173953. The reversal of 61173945 is 54937116.

61173945 is a `hidden beast` number, since 611 + 7 + 39 + 4 + 5 = 666.

It is not a de Polignac number, because 61173945 - 2² = 61173941 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61173941) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 96787 + ... + 97416.

It is an arithmetic number, because the mean of its divisors is an integer number (5049304).

Almost surely, 2^61173945 is an apocalyptic number.

It is an amenable number.

61173945 is a deficient number, since it is larger than the sum of its proper divisors (60009351).

61173945 is a wasteful number, since it uses less digits than its factorization.

61173945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194221 (or 194218 counting only the distinct ones).

The product of its digits is 22680, while the sum is 36.

The square root of 61173945 is about 7821.3774362321. The cubic root of 61173945 is about 394.0235348014.

The spelling of 61173945 in words is "sixty-one million, one hundred seventy-three thousand, nine hundred forty-five".