3729181 has 2 divisors, whose sum is σ = 3729182. Its totient is φ = 3729180.

The previous prime is 3729179. The next prime is 3729191. The reversal of 3729181 is 1819273.

3729181 = 1365² + 1366².

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1865956 + 1863225 = 1366^2 + 1365^2 .

It is an emirp because it is prime and its reverse (1819273) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3729181 - 2¹ = 3729179 is a prime.

It is a super-2 number, since 2×3729181² = 27813581861522, which contains 22 as substring.

Together with 3729179, it forms a pair of twin primes.

3729181 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3729161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1864590 + 1864591.

It is an arithmetic number, because the mean of its divisors is an integer number (1864591).

Almost surely, 2^3729181 is an apocalyptic number.

3729181 is the 1366-th centered square number.

It is an amenable number.

3729181 is a deficient number, since it is larger than the sum of its proper divisors (1).

3729181 is an equidigital number, since it uses as much as digits as its factorization.

3729181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3024, while the sum is 31.

The square root of 3729181 is about 1931.1087488798. The cubic root of 3729181 is about 155.0735828219.

The spelling of 3729181 in words is "three million, seven hundred twenty-nine thousand, one hundred eighty-one".