61172723 has 8 divisors (see below), whose sum is σ = 64489920. Its totient is φ = 57865320.

The previous prime is 61172719. The next prime is 61172731. The reversal of 61172723 is 32727116.

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

It is a cyclic number.

It is not a de Polignac number, because 61172723 - 2² = 61172719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61162723) 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 7 ways as a sum of consecutive naturals, for example, 12908 + ... + 16998.

It is an arithmetic number, because the mean of its divisors is an integer number (8061240).

Almost surely, 2^61172723 is an apocalyptic number.

61172723 is a deficient number, since it is larger than the sum of its proper divisors (3317197).

61172723 is a wasteful number, since it uses less digits than its factorization.

61172723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4897.

The product of its digits is 3528, while the sum is 29.

The square root of 61172723 is about 7821.2993166097. The cubic root of 61172723 is about 394.0209111356.

Adding to 61172723 its reverse (32727116), we get a palindrome (93899839).

The spelling of 61172723 in words is "sixty-one million, one hundred seventy-two thousand, seven hundred twenty-three".