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666431 is a prime number
BaseRepresentation
bin10100010101100111111
31020212011122
42202230333
5132311211
622141155
75443643
oct2425477
91225148
10666431
11415777
122817bb
131a444c
14134c23
15d26db
hexa2b3f

666431 has 2 divisors, whose sum is σ = 666432. Its totient is φ = 666430.

The previous prime is 666427. The next prime is 666433. The reversal of 666431 is 134666.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 666431 - 22 = 666427 is a prime.

It is a super-2 number, since 2×6664312 = 888260555522, which contains 22 as substring.

Together with 666433, it forms a pair of twin primes.

It is a Chen prime.

It is an Ulam number.

It is a nialpdrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 666431.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333215 + 333216.

It is an arithmetic number, because the mean of its divisors is an integer number (333216).

2666431 is an apocalyptic number.

666431 is a deficient number, since it is larger than the sum of its proper divisors (1).

666431 is an equidigital number, since it uses as much as digits as its factorization.

666431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2592, while the sum is 26.

The square root of 666431 is about 816.3522524009. The cubic root of 666431 is about 87.3477515706.

The spelling of 666431 in words is "six hundred sixty-six thousand, four hundred thirty-one".