13072181 has 2 divisors, whose sum is σ = 13072182. Its totient is φ = 13072180.

The previous prime is 13072159. The next prime is 13072219. The reversal of 13072181 is 18127031.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10923025 + 2149156 = 3305^2 + 1466^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13072181 is a prime.

It is a super-2 number, since 2×13072181² = 341763832193522, which contains 22 as substring.

It is a plaindrome in base 15.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13072681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6536090 + 6536091.

It is an arithmetic number, because the mean of its divisors is an integer number (6536091).

Almost surely, 2^13072181 is an apocalyptic number.

It is an amenable number.

13072181 is a deficient number, since it is larger than the sum of its proper divisors (1).

13072181 is an equidigital number, since it uses as much as digits as its factorization.

13072181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 336, while the sum is 23.

The square root of 13072181 is about 3615.5471231890. The cubic root of 13072181 is about 235.5678496296.

The spelling of 13072181 in words is "thirteen million, seventy-two thousand, one hundred eighty-one".