123172213 has 2 divisors, whose sum is σ = 123172214. Its totient is φ = 123172212.

The previous prime is 123172211. The next prime is 123172267. The reversal of 123172213 is 312271321.

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., 88397604 + 34774609 = 9402^2 + 5897^2 .

It is an emirp because it is prime and its reverse (312271321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 123172213 - 2¹ = 123172211 is a prime.

Together with 123172211, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123172211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61586106 + 61586107.

It is an arithmetic number, because the mean of its divisors is an integer number (61586107).

Almost surely, 2^123172213 is an apocalyptic number.

It is an amenable number.

123172213 is a deficient number, since it is larger than the sum of its proper divisors (1).

123172213 is an equidigital number, since it uses as much as digits as its factorization.

123172213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 504, while the sum is 22.

The square root of 123172213 is about 11098.2977523582. The cubic root of 123172213 is about 497.5509748026.

The spelling of 123172213 in words is "one hundred twenty-three million, one hundred seventy-two thousand, two hundred thirteen".