8157081 has 4 divisors (see below), whose sum is σ = 10876112. Its totient is φ = 5438052.

The previous prime is 8157077. The next prime is 8157101. The reversal of 8157081 is 1807518.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 8157081 - 2² = 8157077 is a prime.

It is a super-2 number, since 2×8157081² = 133075940881122, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8157001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1359511 + ... + 1359516.

It is an arithmetic number, because the mean of its divisors is an integer number (2719028).

Almost surely, 2^8157081 is an apocalyptic number.

It is an amenable number.

8157081 is a deficient number, since it is larger than the sum of its proper divisors (2719031).

8157081 is a wasteful number, since it uses less digits than its factorization.

8157081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2719030.

The product of its (nonzero) digits is 2240, while the sum is 30.

The square root of 8157081 is about 2856.0603985210. The cubic root of 8157081 is about 201.3005330711.

The spelling of 8157081 in words is "eight million, one hundred fifty-seven thousand, eighty-one".