157109 has 2 divisors, whose sum is σ = 157110. Its totient is φ = 157108.

The previous prime is 157103. The next prime is 157127. The reversal of 157109 is 901751.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 96100 + 61009 = 310^2 + 247^2 .

It is an emirp because it is prime and its reverse (901751) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 157109 - 2¹⁶ = 91573 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (157103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78554 + 78555.

It is an arithmetic number, because the mean of its divisors is an integer number (78555).

2¹⁵⁷¹⁰⁹ is an apocalyptic number.

It is an amenable number.

157109 is a deficient number, since it is larger than the sum of its proper divisors (1).

157109 is an equidigital number, since it uses as much as digits as its factorization.

157109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 315, while the sum is 23.

The square root of 157109 is about 396.3697768499. The cubic root of 157109 is about 53.9593887614.

The spelling of 157109 in words is "one hundred fifty-seven thousand, one hundred nine".