181361449 has 2 divisors, whose sum is σ = 181361450. Its totient is φ = 181361448.

The previous prime is 181361407. The next prime is 181361483. The reversal of 181361449 is 944163181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 102151449 + 79210000 = 10107^2 + 8900^2 .

It is a cyclic number.

It is not a de Polignac number, because 181361449 - 2⁹ = 181360937 is a prime.

It is not a weakly prime, because it can be changed into another prime (181361489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90680724 + 90680725.

It is an arithmetic number, because the mean of its divisors is an integer number (90680725).

Almost surely, 2^181361449 is an apocalyptic number.

It is an amenable number.

181361449 is a deficient number, since it is larger than the sum of its proper divisors (1).

181361449 is an equidigital number, since it uses as much as digits as its factorization.

181361449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 37.

The square root of 181361449 is about 13467.0504937050. The cubic root of 181361449 is about 566.0415684071.

The spelling of 181361449 in words is "one hundred eighty-one million, three hundred sixty-one thousand, four hundred forty-nine".