7812161 has 8 divisors (see below), whose sum is σ = 8981184. Its totient is φ = 6656400.

The previous prime is 7812137. The next prime is 7812169. The reversal of 7812161 is 1612187.

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 7812161 - 2¹⁸ = 7550017 is a prime.

It is a super-2 number, since 2×7812161² = 122059718979842, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7812161.

It is not an unprimeable number, because it can be changed into a prime (7812169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2015 + ... + 4436.

It is an arithmetic number, because the mean of its divisors is an integer number (1122648).

Almost surely, 2^7812161 is an apocalyptic number.

It is an amenable number.

7812161 is a deficient number, since it is larger than the sum of its proper divisors (1169023).

7812161 is a wasteful number, since it uses less digits than its factorization.

7812161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6631.

The product of its digits is 672, while the sum is 26.

The square root of 7812161 is about 2795.0243290533. The cubic root of 7812161 is about 198.4222614334.

Adding to 7812161 its sum of digits (26), we get a palindrome (7812187).

The spelling of 7812161 in words is "seven million, eight hundred twelve thousand, one hundred sixty-one".