181827157 has 2 divisors, whose sum is σ = 181827158. Its totient is φ = 181827156.

The previous prime is 181827143. The next prime is 181827181. The reversal of 181827157 is 751728181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 121749156 + 60078001 = 11034^2 + 7751^2 .

It is an emirp because it is prime and its reverse (751728181) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 181827157 - 2¹¹ = 181825109 is a prime.

It is a super-2 number, since 2×181827157² = 66122230045405298, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (181857157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90913578 + 90913579.

It is an arithmetic number, because the mean of its divisors is an integer number (90913579).

Almost surely, 2^181827157 is an apocalyptic number.

It is an amenable number.

181827157 is a deficient number, since it is larger than the sum of its proper divisors (1).

181827157 is an equidigital number, since it uses as much as digits as its factorization.

181827157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31360, while the sum is 40.

The square root of 181827157 is about 13484.3300538069. The cubic root of 181827157 is about 566.5256565324.

The spelling of 181827157 in words is "one hundred eighty-one million, eight hundred twenty-seven thousand, one hundred fifty-seven".