181513049 has 2 divisors, whose sum is σ = 181513050. Its totient is φ = 181513048.

The previous prime is 181513043. The next prime is 181513067. The reversal of 181513049 is 940315181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 181387024 + 126025 = 13468^2 + 355^2 .

It is a cyclic number.

It is not a de Polignac number, because 181513049 - 2¹² = 181508953 is a prime.

It is equal to p_10109687 and since 181513049 and 10109687 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (181513043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90756524 + 90756525.

It is an arithmetic number, because the mean of its divisors is an integer number (90756525).

Almost surely, 2^181513049 is an apocalyptic number.

It is an amenable number.

181513049 is a deficient number, since it is larger than the sum of its proper divisors (1).

181513049 is an equidigital number, since it uses as much as digits as its factorization.

181513049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 32.

The square root of 181513049 is about 13472.6778704161. The cubic root of 181513049 is about 566.1992424944.

The spelling of 181513049 in words is "one hundred eighty-one million, five hundred thirteen thousand, forty-nine".