123136451 has 2 divisors, whose sum is σ = 123136452. Its totient is φ = 123136450.

The previous prime is 123136399. The next prime is 123136471. The reversal of 123136451 is 154631321.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 123136451 - 2¹⁰ = 123135427 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 123136451.

It is not a weakly prime, because it can be changed into another prime (123136471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61568225 + 61568226.

It is an arithmetic number, because the mean of its divisors is an integer number (61568226).

Almost surely, 2^123136451 is an apocalyptic number.

123136451 is a deficient number, since it is larger than the sum of its proper divisors (1).

123136451 is an equidigital number, since it uses as much as digits as its factorization.

123136451 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2160, while the sum is 26.

The square root of 123136451 is about 11096.6864874160. The cubic root of 123136451 is about 497.5028169163.

Adding to 123136451 its reverse (154631321), we get a palindrome (277767772).

The spelling of 123136451 in words is "one hundred twenty-three million, one hundred thirty-six thousand, four hundred fifty-one".