123891667 has 2 divisors, whose sum is σ = 123891668. Its totient is φ = 123891666.

The previous prime is 123891661. The next prime is 123891697. The reversal of 123891667 is 766198321.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 123891667 - 2³ = 123891659 is a prime.

It is not a weakly prime, because it can be changed into another prime (123891661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61945833 + 61945834.

It is an arithmetic number, because the mean of its divisors is an integer number (61945834).

Almost surely, 2^123891667 is an apocalyptic number.

123891667 is a deficient number, since it is larger than the sum of its proper divisors (1).

123891667 is an equidigital number, since it uses as much as digits as its factorization.

123891667 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 43.

The square root of 123891667 is about 11130.6633674728. The cubic root of 123891667 is about 498.5178333722.

The spelling of 123891667 in words is "one hundred twenty-three million, eight hundred ninety-one thousand, six hundred sixty-seven".