8161139 has 8 divisors (see below), whose sum is σ = 9875808. Its totient is φ = 6583680.

The previous prime is 8161121. The next prime is 8161183. The reversal of 8161139 is 9311618.

It is a happy number.

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 8161139 - 2¹² = 8157043 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8161039) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34172 + ... + 34409.

It is an arithmetic number, because the mean of its divisors is an integer number (1234476).

Almost surely, 2^8161139 is an apocalyptic number.

8161139 is a deficient number, since it is larger than the sum of its proper divisors (1714669).

8161139 is a wasteful number, since it uses less digits than its factorization.

8161139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68605.

The product of its digits is 1296, while the sum is 29.

The square root of 8161139 is about 2856.7707293376. The cubic root of 8161139 is about 201.3339086598. Note that the first 3 decimals are identical.

The spelling of 8161139 in words is "eight million, one hundred sixty-one thousand, one hundred thirty-nine".