123401261 has 2 divisors, whose sum is σ = 123401262. Its totient is φ = 123401260.

The previous prime is 123401221. The next prime is 123401309. The reversal of 123401261 is 162104321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 120780100 + 2621161 = 10990^2 + 1619^2 .

It is an emirp because it is prime and its reverse (162104321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 123401261 - 2²² = 119206957 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123401221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61700630 + 61700631.

It is an arithmetic number, because the mean of its divisors is an integer number (61700631).

Almost surely, 2^123401261 is an apocalyptic number.

It is an amenable number.

123401261 is a deficient number, since it is larger than the sum of its proper divisors (1).

123401261 is an equidigital number, since it uses as much as digits as its factorization.

123401261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 123401261 is about 11108.6120195099. The cubic root of 123401261 is about 497.8591949897.

Adding to 123401261 its reverse (162104321), we get a palindrome (285505582).

The spelling of 123401261 in words is "one hundred twenty-three million, four hundred one thousand, two hundred sixty-one".