7858161 has 8 divisors (see below), whose sum is σ = 11641760. Its totient is φ = 5238756.

The previous prime is 7858141. The next prime is 7858181. The reversal of 7858161 is 1618587.

7858161 is a `hidden beast` number, since 78 + 581 + 6 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (7858141) and next prime (7858181).

It is not a de Polignac number, because 7858161 - 2⁵ = 7858129 is a prime.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7858141) 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, 145495 + ... + 145548.

It is an arithmetic number, because the mean of its divisors is an integer number (1455220).

Almost surely, 2^7858161 is an apocalyptic number.

It is an amenable number.

7858161 is a deficient number, since it is larger than the sum of its proper divisors (3783599).

7858161 is a wasteful number, since it uses less digits than its factorization.

7858161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291052 (or 291046 counting only the distinct ones).

The product of its digits is 13440, while the sum is 36.

The square root of 7858161 is about 2803.2411598006. The cubic root of 7858161 is about 198.8109531809.

The spelling of 7858161 in words is "seven million, eight hundred fifty-eight thousand, one hundred sixty-one".