123705157 has 2 divisors, whose sum is σ = 123705158. Its totient is φ = 123705156.

The previous prime is 123705139. The next prime is 123705191. The reversal of 123705157 is 751507321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64738116 + 58967041 = 8046^2 + 7679^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123705157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123705557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61852578 + 61852579.

It is an arithmetic number, because the mean of its divisors is an integer number (61852579).

Almost surely, 2^123705157 is an apocalyptic number.

It is an amenable number.

123705157 is a deficient number, since it is larger than the sum of its proper divisors (1).

123705157 is an equidigital number, since it uses as much as digits as its factorization.

123705157 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7350, while the sum is 31.

The square root of 123705157 is about 11122.2820050563. The cubic root of 123705157 is about 498.2675468116.

The spelling of 123705157 in words is "one hundred twenty-three million, seven hundred five thousand, one hundred fifty-seven".