8161745 has 8 divisors (see below), whose sum is σ = 9904680. Its totient is φ = 6455680.

The previous prime is 8161687. The next prime is 8161753. The reversal of 8161745 is 5471618.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 44944 + 8116801 = 212^2 + 2849^2 .

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

It is not a de Polignac number, because 8161745 - 2²² = 3967441 is a prime.

It is a super-2 number, since 2×8161745² = 133228162890050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8726 + ... + 9615.

It is an arithmetic number, because the mean of its divisors is an integer number (1238085).

Almost surely, 2^8161745 is an apocalyptic number.

It is an amenable number.

8161745 is a deficient number, since it is larger than the sum of its proper divisors (1742935).

8161745 is a wasteful number, since it uses less digits than its factorization.

8161745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18435.

The product of its digits is 6720, while the sum is 32.

The square root of 8161745 is about 2856.8767911830. The cubic root of 8161745 is about 201.3388918420.

The spelling of 8161745 in words is "eight million, one hundred sixty-one thousand, seven hundred forty-five".