123698261 has 2 divisors, whose sum is σ = 123698262. Its totient is φ = 123698260.

The previous prime is 123698251. The next prime is 123698291. The reversal of 123698261 is 162896321.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67732900 + 55965361 = 8230^2 + 7481^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123698261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123698251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61849130 + 61849131.

It is an arithmetic number, because the mean of its divisors is an integer number (61849131).

Almost surely, 2^123698261 is an apocalyptic number.

It is an amenable number.

123698261 is a deficient number, since it is larger than the sum of its proper divisors (1).

123698261 is an equidigital number, since it uses as much as digits as its factorization.

123698261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31104, while the sum is 38.

The square root of 123698261 is about 11121.9719924121. The cubic root of 123698261 is about 498.2582879229.

The spelling of 123698261 in words is "one hundred twenty-three million, six hundred ninety-eight thousand, two hundred sixty-one".