123899159 has 4 divisors (see below), whose sum is σ = 124053120. Its totient is φ = 123745200.

The previous prime is 123899143. The next prime is 123899173. The reversal of 123899159 is 951998321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 951998321 = 26801 ⋅35521.

It is a cyclic number.

It is not a de Polignac number, because 123899159 - 2⁴ = 123899143 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123899359) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75767 + ... + 77384.

It is an arithmetic number, because the mean of its divisors is an integer number (31013280).

Almost surely, 2^123899159 is an apocalyptic number.

123899159 is a deficient number, since it is larger than the sum of its proper divisors (153961).

123899159 is an equidigital number, since it uses as much as digits as its factorization.

123899159 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153960.

The product of its digits is 174960, while the sum is 47.

The square root of 123899159 is about 11130.9999101608. Note that the first 4 decimals coincide. The cubic root of 123899159 is about 498.5278819908.

The spelling of 123899159 in words is "one hundred twenty-three million, eight hundred ninety-nine thousand, one hundred fifty-nine".