123121477 has 2 divisors, whose sum is σ = 123121478. Its totient is φ = 123121476.

The previous prime is 123121457. The next prime is 123121511. The reversal of 123121477 is 774121321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65270241 + 57851236 = 8079^2 + 7606^2 .

It is an emirp because it is prime and its reverse (774121321) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123121477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123121417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61560738 + 61560739.

It is an arithmetic number, because the mean of its divisors is an integer number (61560739).

Almost surely, 2^123121477 is an apocalyptic number.

It is an amenable number.

123121477 is a deficient number, since it is larger than the sum of its proper divisors (1).

123121477 is an equidigital number, since it uses as much as digits as its factorization.

123121477 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2352, while the sum is 28.

The square root of 123121477 is about 11096.0117609887. The cubic root of 123121477 is about 497.4826498330.

Adding to 123121477 its reverse (774121321), we get a palindrome (897242798).

The spelling of 123121477 in words is "one hundred twenty-three million, one hundred twenty-one thousand, four hundred seventy-seven".