181297397 has 2 divisors, whose sum is σ = 181297398. Its totient is φ = 181297396.

The previous prime is 181297387. The next prime is 181297433. The reversal of 181297397 is 793792181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 165225316 + 16072081 = 12854^2 + 4009^2 .

It is a cyclic number.

It is not a de Polignac number, because 181297397 - 2⁴ = 181297381 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (181297387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90648698 + 90648699.

It is an arithmetic number, because the mean of its divisors is an integer number (90648699).

Almost surely, 2^181297397 is an apocalyptic number.

It is an amenable number.

181297397 is a deficient number, since it is larger than the sum of its proper divisors (1).

181297397 is an equidigital number, since it uses as much as digits as its factorization.

181297397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 190512, while the sum is 47.

The square root of 181297397 is about 13464.6721831614. The cubic root of 181297397 is about 565.9749236602.

The spelling of 181297397 in words is "one hundred eighty-one million, two hundred ninety-seven thousand, three hundred ninety-seven".