123139699 has 2 divisors, whose sum is σ = 123139700. Its totient is φ = 123139698.

The previous prime is 123139669. The next prime is 123139733. The reversal of 123139699 is 996931321.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 123139699 - 2¹⁵ = 123106931 is a prime.

It is not a weakly prime, because it can be changed into another prime (123139669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61569849 + 61569850.

It is an arithmetic number, because the mean of its divisors is an integer number (61569850).

Almost surely, 2^123139699 is an apocalyptic number.

123139699 is a deficient number, since it is larger than the sum of its proper divisors (1).

123139699 is an equidigital number, since it uses as much as digits as its factorization.

123139699 is an evil number, because the sum of its binary digits is even.

The product of its digits is 78732, while the sum is 43.

The square root of 123139699 is about 11096.8328364448. The cubic root of 123139699 is about 497.5071911286.

The spelling of 123139699 in words is "one hundred twenty-three million, one hundred thirty-nine thousand, six hundred ninety-nine".