123125257 has 2 divisors, whose sum is σ = 123125258. Its totient is φ = 123125256.

The previous prime is 123125251. The next prime is 123125269. The reversal of 123125257 is 752521321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 118613881 + 4511376 = 10891^2 + 2124^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123125257 is a prime.

It is a super-2 number, since 2×123125257² = 30319657822632098, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (123125251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61562628 + 61562629.

It is an arithmetic number, because the mean of its divisors is an integer number (61562629).

Almost surely, 2^123125257 is an apocalyptic number.

It is an amenable number.

123125257 is a deficient number, since it is larger than the sum of its proper divisors (1).

123125257 is an equidigital number, since it uses as much as digits as its factorization.

123125257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4200, while the sum is 28.

The square root of 123125257 is about 11096.1820911519. The cubic root of 123125257 is about 497.4877409166.

Adding to 123125257 its reverse (752521321), we get a palindrome (875646578).

The spelling of 123125257 in words is "one hundred twenty-three million, one hundred twenty-five thousand, two hundred fifty-seven".