123420137 has 2 divisors, whose sum is σ = 123420138. Its totient is φ = 123420136.

The previous prime is 123420071. The next prime is 123420169. The reversal of 123420137 is 731024321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67634176 + 55785961 = 8224^2 + 7469^2 .

It is a cyclic number.

It is not a de Polignac number, because 123420137 - 2²⁶ = 56311273 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (123423137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61710068 + 61710069.

It is an arithmetic number, because the mean of its divisors is an integer number (61710069).

Almost surely, 2^123420137 is an apocalyptic number.

It is an amenable number.

123420137 is a deficient number, since it is larger than the sum of its proper divisors (1).

123420137 is an equidigital number, since it uses as much as digits as its factorization.

123420137 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 23.

The square root of 123420137 is about 11109.4615981154. The cubic root of 123420137 is about 497.8845786067.

Adding to 123420137 its reverse (731024321), we get a palindrome (854444458).

The spelling of 123420137 in words is "one hundred twenty-three million, four hundred twenty thousand, one hundred thirty-seven".