81172346 has 8 divisors (see below), whose sum is σ = 122431764. Its totient is φ = 40361760.

The previous prime is 81172327. The next prime is 81172367. The reversal of 81172346 is 64327118.

It can be written as a sum of positive squares in 2 ways, for example, as 54184321 + 26988025 = 7361^2 + 5195^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 111755 + ... + 112478.

Almost surely, 2^81172346 is an apocalyptic number.

81172346 is a deficient number, since it is larger than the sum of its proper divisors (41259418).

81172346 is a wasteful number, since it uses less digits than its factorization.

81172346 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224416.

The product of its digits is 8064, while the sum is 32.

The square root of 81172346 is about 9009.5696900573. The cubic root of 81172346 is about 432.9815252391.

It can be divided in two parts, 81172 and 346, that added together give a palindrome (81518).

The spelling of 81172346 in words is "eighty-one million, one hundred seventy-two thousand, three hundred forty-six".