866418431 has 2 divisors, whose sum is σ = 866418432. Its totient is φ = 866418430.

The previous prime is 866418389. The next prime is 866418433. The reversal of 866418431 is 134814668.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 866418431 - 2¹⁰ = 866417407 is a prime.

It is a super-2 number, since 2×866418431² = 1501361795153003522, which contains 22 as substring.

Together with 866418433, 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 (866418433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433209215 + 433209216.

It is an arithmetic number, because the mean of its divisors is an integer number (433209216).

Almost surely, 2^866418431 is an apocalyptic number.

866418431 is a deficient number, since it is larger than the sum of its proper divisors (1).

866418431 is an equidigital number, since it uses as much as digits as its factorization.

866418431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 110592, while the sum is 41.

The square root of 866418431 is about 29434.9865126519. The cubic root of 866418431 is about 953.3284653307.

The spelling of 866418431 in words is "eight hundred sixty-six million, four hundred eighteen thousand, four hundred thirty-one".