181272313 has 2 divisors, whose sum is σ = 181272314. Its totient is φ = 181272312.

The previous prime is 181272277. The next prime is 181272347. The reversal of 181272313 is 313272181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 178409449 + 2862864 = 13357^2 + 1692^2 .

It is a cyclic number.

It is not a de Polignac number, because 181272313 - 2⁹ = 181271801 is a prime.

It is not a weakly prime, because it can be changed into another prime (181272353) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90636156 + 90636157.

It is an arithmetic number, because the mean of its divisors is an integer number (90636157).

Almost surely, 2^181272313 is an apocalyptic number.

It is an amenable number.

181272313 is a deficient number, since it is larger than the sum of its proper divisors (1).

181272313 is an equidigital number, since it uses as much as digits as its factorization.

181272313 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2016, while the sum is 28.

The square root of 181272313 is about 13463.7406763499. The cubic root of 181272313 is about 565.9488200132.

The spelling of 181272313 in words is "one hundred eighty-one million, two hundred seventy-two thousand, three hundred thirteen".