123172279 has 2 divisors, whose sum is σ = 123172280. Its totient is φ = 123172278.

The previous prime is 123172267. The next prime is 123172303. The reversal of 123172279 is 972271321.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 123172279 - 2⁷ = 123172151 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123176279) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61586139 + 61586140.

It is an arithmetic number, because the mean of its divisors is an integer number (61586140).

Almost surely, 2^123172279 is an apocalyptic number.

123172279 is a deficient number, since it is larger than the sum of its proper divisors (1).

123172279 is an equidigital number, since it uses as much as digits as its factorization.

123172279 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10584, while the sum is 34.

The square root of 123172279 is about 11098.3007257868. The cubic root of 123172279 is about 497.5510636710.

The spelling of 123172279 in words is "one hundred twenty-three million, one hundred seventy-two thousand, two hundred seventy-nine".