157181 has 2 divisors, whose sum is σ = 157182. Its totient is φ = 157180.

The previous prime is 157177. The next prime is 157189. The reversal of 157181 is 181751.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 156025 + 1156 = 395^2 + 34^2 .

It is an emirp because it is prime and its reverse (181751) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 157181 - 2² = 157177 is a prime.

It is a super-2 number, since 2×157181² = 49411733522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (157189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78590 + 78591.

It is an arithmetic number, because the mean of its divisors is an integer number (78591).

2¹⁵⁷¹⁸¹ is an apocalyptic number.

It is an amenable number.

157181 is a deficient number, since it is larger than the sum of its proper divisors (1).

157181 is an equidigital number, since it uses as much as digits as its factorization.

157181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 280, while the sum is 23.

The square root of 157181 is about 396.4605907275. The cubic root of 157181 is about 53.9676303488.

Multiplying 157181 by its sum of digits (23), we get a palindrome (3615163).

The spelling of 157181 in words is "one hundred fifty-seven thousand, one hundred eighty-one".