157123 has 4 divisors (see below), whose sum is σ = 159408. Its totient is φ = 154840.

The previous prime is 157109. The next prime is 157127. The reversal of 157123 is 321751.

157123 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 157123 - 2¹³ = 148931 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 157123.

It is not an unprimeable number, because it can be changed into a prime (157127) 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, 1036 + ... + 1177.

It is an arithmetic number, because the mean of its divisors is an integer number (39852).

2¹⁵⁷¹²³ is an apocalyptic number.

157123 is a deficient number, since it is larger than the sum of its proper divisors (2285).

157123 is an equidigital number, since it uses as much as digits as its factorization.

157123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2284.

The product of its digits is 210, while the sum is 19.

The square root of 157123 is about 396.3874367333. The cubic root of 157123 is about 53.9609914895.

Adding to 157123 its reverse (321751), we get a palindrome (478874).

The spelling of 157123 in words is "one hundred fifty-seven thousand, one hundred twenty-three".