123157211 has 2 divisors, whose sum is σ = 123157212. Its totient is φ = 123157210.

The previous prime is 123157207. The next prime is 123157219. The reversal of 123157211 is 112751321.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 123157211 - 2² = 123157207 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (123157219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61578605 + 61578606.

It is an arithmetic number, because the mean of its divisors is an integer number (61578606).

Almost surely, 2^123157211 is an apocalyptic number.

123157211 is a deficient number, since it is larger than the sum of its proper divisors (1).

123157211 is an equidigital number, since it uses as much as digits as its factorization.

123157211 is an evil number, because the sum of its binary digits is even.

The product of its digits is 420, while the sum is 23.

The square root of 123157211 is about 11097.6218623631. The cubic root of 123157211 is about 497.5307739185.

The spelling of 123157211 in words is "one hundred twenty-three million, one hundred fifty-seven thousand, two hundred eleven".