123994721 has 2 divisors, whose sum is σ = 123994722. Its totient is φ = 123994720.

The previous prime is 123994693. The next prime is 123994723. The reversal of 123994721 is 127499321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 112678225 + 11316496 = 10615^2 + 3364^2 .

It is a cyclic number.

It is not a de Polignac number, because 123994721 - 2⁶ = 123994657 is a prime.

Together with 123994723, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (123994723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61997360 + 61997361.

It is an arithmetic number, because the mean of its divisors is an integer number (61997361).

Almost surely, 2^123994721 is an apocalyptic number.

It is an amenable number.

123994721 is a deficient number, since it is larger than the sum of its proper divisors (1).

123994721 is an equidigital number, since it uses as much as digits as its factorization.

123994721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27216, while the sum is 38.

The square root of 123994721 is about 11135.2916890399. The cubic root of 123994721 is about 498.6560186652.

The spelling of 123994721 in words is "one hundred twenty-three million, nine hundred ninety-four thousand, seven hundred twenty-one".