123851261 has 2 divisors, whose sum is σ = 123851262. Its totient is φ = 123851260.

The previous prime is 123851237. The next prime is 123851267. The reversal of 123851261 is 162158321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 99900025 + 23951236 = 9995^2 + 4894^2 .

It is a cyclic number.

It is not a de Polignac number, because 123851261 - 2⁶ = 123851197 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123851267) 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, 61925630 + 61925631.

It is an arithmetic number, because the mean of its divisors is an integer number (61925631).

Almost surely, 2^123851261 is an apocalyptic number.

It is an amenable number.

123851261 is a deficient number, since it is larger than the sum of its proper divisors (1).

123851261 is an equidigital number, since it uses as much as digits as its factorization.

123851261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2880, while the sum is 29.

The square root of 123851261 is about 11128.8481434513. The cubic root of 123851261 is about 498.4636319819.

The spelling of 123851261 in words is "one hundred twenty-three million, eight hundred fifty-one thousand, two hundred sixty-one".