431113261 has 2 divisors, whose sum is σ = 431113262. Its totient is φ = 431113260.

The previous prime is 431113259. The next prime is 431113337. The reversal of 431113261 is 162311134.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 367910761 + 63202500 = 19181^2 + 7950^2 .

It is a cyclic number.

It is not a de Polignac number, because 431113261 - 2¹ = 431113259 is a prime.

Together with 431113259, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (431113201) 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, 215556630 + 215556631.

It is an arithmetic number, because the mean of its divisors is an integer number (215556631).

Almost surely, 2^431113261 is an apocalyptic number.

It is an amenable number.

431113261 is a deficient number, since it is larger than the sum of its proper divisors (1).

431113261 is an equidigital number, since it uses as much as digits as its factorization.

431113261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 432, while the sum is 22.

The square root of 431113261 is about 20763.2671080444. The cubic root of 431113261 is about 755.4350436309.

Adding to 431113261 its reverse (162311134), we get a palindrome (593424395).

The spelling of 431113261 in words is "four hundred thirty-one million, one hundred thirteen thousand, two hundred sixty-one".