157827181 has 2 divisors, whose sum is σ = 157827182. Its totient is φ = 157827180.

The previous prime is 157827179. The next prime is 157827199. The reversal of 157827181 is 181728751.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 157000900 + 826281 = 12530^2 + 909^2 .

It is an emirp because it is prime and its reverse (181728751) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 157827181 - 2¹ = 157827179 is a prime.

It is a super-2 number, since 2×157827181² = 49818838124813522, which contains 22 as substring.

Together with 157827179, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (157827781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78913590 + 78913591.

It is an arithmetic number, because the mean of its divisors is an integer number (78913591).

Almost surely, 2^157827181 is an apocalyptic number.

It is an amenable number.

157827181 is a deficient number, since it is larger than the sum of its proper divisors (1).

157827181 is an equidigital number, since it uses as much as digits as its factorization.

157827181 is an odious number, because the sum of its binary digits is odd.

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

The square root of 157827181 is about 12562.9288384516. The cubic root of 157827181 is about 540.4148401224.

The spelling of 157827181 in words is "one hundred fifty-seven million, eight hundred twenty-seven thousand, one hundred eighty-one".