123921023 has 2 divisors, whose sum is σ = 123921024. Its totient is φ = 123921022.

The previous prime is 123921013. The next prime is 123921047. The reversal of 123921023 is 320129321.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 123921023 - 2¹⁴ = 123904639 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 123921023.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123921013) 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, 61960511 + 61960512.

It is an arithmetic number, because the mean of its divisors is an integer number (61960512).

Almost surely, 2^123921023 is an apocalyptic number.

123921023 is a deficient number, since it is larger than the sum of its proper divisors (1).

123921023 is an equidigital number, since it uses as much as digits as its factorization.

123921023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 123921023 is about 11131.9819888464. The cubic root of 123921023 is about 498.5572046879.

The spelling of 123921023 in words is "one hundred twenty-three million, nine hundred twenty-one thousand, twenty-three".