8157109 has 2 divisors, whose sum is σ = 8157110. Its totient is φ = 8157108.

The previous prime is 8157101. The next prime is 8157113. The reversal of 8157109 is 9017518.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8151025 + 6084 = 2855^2 + 78^2 .

It is a cyclic number.

It is not a de Polignac number, because 8157109 - 2³ = 8157101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8157101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4078554 + 4078555.

It is an arithmetic number, because the mean of its divisors is an integer number (4078555).

Almost surely, 2^8157109 is an apocalyptic number.

It is an amenable number.

8157109 is a deficient number, since it is larger than the sum of its proper divisors (1).

8157109 is an equidigital number, since it uses as much as digits as its factorization.

8157109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2520, while the sum is 31.

The square root of 8157109 is about 2856.0653003739. The cubic root of 8157109 is about 201.3007633990.

The spelling of 8157109 in words is "eight million, one hundred fifty-seven thousand, one hundred nine".