123155771 has 2 divisors, whose sum is σ = 123155772. Its totient is φ = 123155770.

The previous prime is 123155749. The next prime is 123155783. The reversal of 123155771 is 177551321.

It is a strong prime.

It is an emirp because it is prime and its reverse (177551321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 123155771 - 2²² = 118961467 is a prime.

It is not a weakly prime, because it can be changed into another prime (123155471) 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, 61577885 + 61577886.

It is an arithmetic number, because the mean of its divisors is an integer number (61577886).

Almost surely, 2^123155771 is an apocalyptic number.

123155771 is a deficient number, since it is larger than the sum of its proper divisors (1).

123155771 is an equidigital number, since it uses as much as digits as its factorization.

123155771 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7350, while the sum is 32.

The square root of 123155771 is about 11097.5569834086. The cubic root of 123155771 is about 497.5288348059.

The spelling of 123155771 in words is "one hundred twenty-three million, one hundred fifty-five thousand, seven hundred seventy-one".