123899173 has 2 divisors, whose sum is σ = 123899174. Its totient is φ = 123899172.

The previous prime is 123899143. The next prime is 123899197. The reversal of 123899173 is 371998321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 109474369 + 14424804 = 10463^2 + 3798^2 .

It is a cyclic number.

It is not a de Polignac number, because 123899173 - 2¹³ = 123890981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123899123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61949586 + 61949587.

It is an arithmetic number, because the mean of its divisors is an integer number (61949587).

Almost surely, 2^123899173 is an apocalyptic number.

It is an amenable number.

123899173 is a deficient number, since it is larger than the sum of its proper divisors (1).

123899173 is an equidigital number, since it uses as much as digits as its factorization.

123899173 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81648, while the sum is 43.

The square root of 123899173 is about 11131.0005390351. Note that the first 3 decimals coincide. The cubic root of 123899173 is about 498.5279007679.

The spelling of 123899173 in words is "one hundred twenty-three million, eight hundred ninety-nine thousand, one hundred seventy-three".