123747121 has 2 divisors, whose sum is σ = 123747122. Its totient is φ = 123747120.

The previous prime is 123747083. The next prime is 123747139. The reversal of 123747121 is 121747321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 112784400 + 10962721 = 10620^2 + 3311^2 .

It is a cyclic number.

It is not a de Polignac number, because 123747121 - 2²³ = 115358513 is a prime.

It is a Chen prime.

It is equal to p_7042834 and since 123747121 and 7042834 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 123747121.

It is not a weakly prime, because it can be changed into another prime (123747821) 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, 61873560 + 61873561.

It is an arithmetic number, because the mean of its divisors is an integer number (61873561).

Almost surely, 2^123747121 is an apocalyptic number.

It is an amenable number.

123747121 is a deficient number, since it is larger than the sum of its proper divisors (1).

123747121 is an equidigital number, since it uses as much as digits as its factorization.

123747121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2352, while the sum is 28.

The square root of 123747121 is about 11124.1683284639. The cubic root of 123747121 is about 498.3238822034.

The spelling of 123747121 in words is "one hundred twenty-three million, seven hundred forty-seven thousand, one hundred twenty-one".