181457 has 2 divisors, whose sum is σ = 181458. Its totient is φ = 181456.

The previous prime is 181439. The next prime is 181459. The reversal of 181457 is 754181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 179776 + 1681 = 424^2 + 41^2 .

It is an emirp because it is prime and its reverse (754181) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 181457 - 2⁸ = 181201 is a prime.

Together with 181459, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (181459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90728 + 90729.

It is an arithmetic number, because the mean of its divisors is an integer number (90729).

2¹⁸¹⁴⁵⁷ is an apocalyptic number.

It is an amenable number.

181457 is a deficient number, since it is larger than the sum of its proper divisors (1).

181457 is an equidigital number, since it uses as much as digits as its factorization.

181457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1120, while the sum is 26.

The square root of 181457 is about 425.9776989468. The cubic root of 181457 is about 56.6140958038.

The spelling of 181457 in words is "one hundred eighty-one thousand, four hundred fifty-seven".