181007149 has 2 divisors, whose sum is σ = 181007150. Its totient is φ = 181007148.

The previous prime is 181007119. The next prime is 181007161. The reversal of 181007149 is 941700181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 157678249 + 23328900 = 12557^2 + 4830^2 .

It is a cyclic number.

It is not a de Polignac number, because 181007149 - 2⁵ = 181007117 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 181007149.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (181007119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90503574 + 90503575.

It is an arithmetic number, because the mean of its divisors is an integer number (90503575).

Almost surely, 2^181007149 is an apocalyptic number.

It is an amenable number.

181007149 is a deficient number, since it is larger than the sum of its proper divisors (1).

181007149 is an equidigital number, since it uses as much as digits as its factorization.

181007149 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 31.

The square root of 181007149 is about 13453.8897349428. The cubic root of 181007149 is about 565.6727298896.

The spelling of 181007149 in words is "one hundred eighty-one million, seven thousand, one hundred forty-nine".