266342431 has 2 divisors, whose sum is σ = 266342432. Its totient is φ = 266342430.

The previous prime is 266342429. The next prime is 266342441. The reversal of 266342431 is 134243662.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 266342431 - 2¹ = 266342429 is a prime.

It is a super-2 number, since 2×266342431² = 141876581101979522, which contains 22 as substring.

Together with 266342429, it forms a pair of twin primes.

It is equal to p_14523196 and since 266342431 and 14523196 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 266342393 and 266342402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (266342411) 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, 133171215 + 133171216.

It is an arithmetic number, because the mean of its divisors is an integer number (133171216).

Almost surely, 2^266342431 is an apocalyptic number.

266342431 is a deficient number, since it is larger than the sum of its proper divisors (1).

266342431 is an equidigital number, since it uses as much as digits as its factorization.

266342431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 31.

The square root of 266342431 is about 16320.0009497549. Note that the first 3 decimals coincide. The cubic root of 266342431 is about 643.3986121905.

Subtracting from 266342431 its sum of digits (31), we obtain a square (266342400 = 16320²).

The spelling of 266342431 in words is "two hundred sixty-six million, three hundred forty-two thousand, four hundred thirty-one".