123656151 has 4 divisors (see below), whose sum is σ = 164874872. Its totient is φ = 82437432.

The previous prime is 123656149. The next prime is 123656167. The reversal of 123656151 is 151656321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 151656321 = 3 ⋅50552107.

It is not a de Polignac number, because 123656151 - 2¹ = 123656149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123656111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20609356 + ... + 20609361.

It is an arithmetic number, because the mean of its divisors is an integer number (41218718).

Almost surely, 2^123656151 is an apocalyptic number.

123656151 is a deficient number, since it is larger than the sum of its proper divisors (41218721).

123656151 is an equidigital number, since it uses as much as digits as its factorization.

123656151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41218720.

The product of its digits is 5400, while the sum is 30.

The square root of 123656151 is about 11120.0787317357. The cubic root of 123656151 is about 498.2017416204.

The spelling of 123656151 in words is "one hundred twenty-three million, six hundred fifty-six thousand, one hundred fifty-one".