667941431 has 2 divisors, whose sum is σ = 667941432. Its totient is φ = 667941430.

The previous prime is 667941377. The next prime is 667941433. The reversal of 667941431 is 134149766.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 667941431 - 2¹⁴ = 667925047 is a prime.

It is a super-2 number, since 2×667941431² = 892291510492655522, which contains 22 as substring.

Together with 667941433, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (667941433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333970715 + 333970716.

It is an arithmetic number, because the mean of its divisors is an integer number (333970716).

Almost surely, 2^667941431 is an apocalyptic number.

667941431 is a deficient number, since it is larger than the sum of its proper divisors (1).

667941431 is an equidigital number, since it uses as much as digits as its factorization.

667941431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 41.

The square root of 667941431 is about 25844.5628904805. The cubic root of 667941431 is about 874.1369148249.

It can be divided in two parts, 66 and 7941431, that added together give a palindrome (7941497).

The spelling of 667941431 in words is "six hundred sixty-seven million, nine hundred forty-one thousand, four hundred thirty-one".