181333157 has 2 divisors, whose sum is σ = 181333158. Its totient is φ = 181333156.

The previous prime is 181333153. The next prime is 181333199. The reversal of 181333157 is 751333181.

It is a Cunningham number, because it is equal to 13466²+1.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 181333156 + 1 = 13466^2 + 1^2 .

It is a cyclic number.

It is not a de Polignac number, because 181333157 - 2² = 181333153 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (181333151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90666578 + 90666579.

It is an arithmetic number, because the mean of its divisors is an integer number (90666579).

Almost surely, 2^181333157 is an apocalyptic number.

It is an amenable number.

181333157 is a deficient number, since it is larger than the sum of its proper divisors (1).

181333157 is an equidigital number, since it uses as much as digits as its factorization.

181333157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7560, while the sum is 32.

The square root of 181333157 is about 13466.0000371306. Note that the first 4 decimals coincide. The cubic root of 181333157 is about 566.0121331165.

The spelling of 181333157 in words is "one hundred eighty-one million, three hundred thirty-three thousand, one hundred fifty-seven".