266431001 has 2 divisors, whose sum is σ = 266431002. Its totient is φ = 266431000.

The previous prime is 266430991. The next prime is 266431003. The reversal of 266431001 is 100134662.

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., 261145600 + 5285401 = 16160^2 + 2299^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-266431001 is a prime.

Together with 266431003, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (266431003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133215500 + 133215501.

It is an arithmetic number, because the mean of its divisors is an integer number (133215501).

Almost surely, 2^266431001 is an apocalyptic number.

It is an amenable number.

266431001 is a deficient number, since it is larger than the sum of its proper divisors (1).

266431001 is an equidigital number, since it uses as much as digits as its factorization.

266431001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 266431001 is about 16322.7142657096. The cubic root of 266431001 is about 643.4699232709.

Adding to 266431001 its reverse (100134662), we get a palindrome (366565663).

The spelling of 266431001 in words is "two hundred sixty-six million, four hundred thirty-one thousand, one".