123140291 has 2 divisors, whose sum is σ = 123140292. Its totient is φ = 123140290.

The previous prime is 123140279. The next prime is 123140327. The reversal of 123140291 is 192041321.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 123140291 - 2¹⁴ = 123123907 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (123140221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61570145 + 61570146.

It is an arithmetic number, because the mean of its divisors is an integer number (61570146).

Almost surely, 2^123140291 is an apocalyptic number.

123140291 is a deficient number, since it is larger than the sum of its proper divisors (1).

123140291 is an equidigital number, since it uses as much as digits as its factorization.

123140291 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 123140291 is about 11096.8595106904. The cubic root of 123140291 is about 497.5079883905.

The spelling of 123140291 in words is "one hundred twenty-three million, one hundred forty thousand, two hundred ninety-one".