431211161 has 2 divisors, whose sum is σ = 431211162. Its totient is φ = 431211160.

The previous prime is 431211113. The next prime is 431211173. The reversal of 431211161 is 161112134.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 290907136 + 140304025 = 17056^2 + 11845^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-431211161 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (431211191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 215605580 + 215605581.

It is an arithmetic number, because the mean of its divisors is an integer number (215605581).

Almost surely, 2^431211161 is an apocalyptic number.

It is an amenable number.

431211161 is a deficient number, since it is larger than the sum of its proper divisors (1).

431211161 is an equidigital number, since it uses as much as digits as its factorization.

431211161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 144, while the sum is 20.

The square root of 431211161 is about 20765.6245030098. The cubic root of 431211161 is about 755.4922223354.

Adding to 431211161 its reverse (161112134), we get a palindrome (592323295).

The spelling of 431211161 in words is "four hundred thirty-one million, two hundred eleven thousand, one hundred sixty-one".