123290261 has 2 divisors, whose sum is σ = 123290262. Its totient is φ = 123290260.

The previous prime is 123290213. The next prime is 123290263. The reversal of 123290261 is 162092321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 69722500 + 53567761 = 8350^2 + 7319^2 .

It is a cyclic number.

It is not a de Polignac number, because 123290261 - 2⁶ = 123290197 is a prime.

Together with 123290263, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 123290261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123290263) 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, 61645130 + 61645131.

It is an arithmetic number, because the mean of its divisors is an integer number (61645131).

Almost surely, 2^123290261 is an apocalyptic number.

It is an amenable number.

123290261 is a deficient number, since it is larger than the sum of its proper divisors (1).

123290261 is an equidigital number, since it uses as much as digits as its factorization.

123290261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 123290261 is about 11103.6147717759. The cubic root of 123290261 is about 497.7098746665.

The spelling of 123290261 in words is "one hundred twenty-three million, two hundred ninety thousand, two hundred sixty-one".