1678123211 has 2 divisors, whose sum is σ = 1678123212. Its totient is φ = 1678123210.

The previous prime is 1678123207. The next prime is 1678123241. The reversal of 1678123211 is 1123218761.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1678123211 - 2² = 1678123207 is a prime.

It is a super-2 number, since 2×1678123211² = 5632195022593901042, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1678123201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 839061605 + 839061606.

It is an arithmetic number, because the mean of its divisors is an integer number (839061606).

Almost surely, 2^1678123211 is an apocalyptic number.

1678123211 is a deficient number, since it is larger than the sum of its proper divisors (1).

1678123211 is an equidigital number, since it uses as much as digits as its factorization.

1678123211 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4032, while the sum is 32.

The square root of 1678123211 is about 40964.9021846751. The cubic root of 1678123211 is about 1188.3415475374.

The spelling of 1678123211 in words is "one billion, six hundred seventy-eight million, one hundred twenty-three thousand, two hundred eleven".