123551641 has 4 divisors (see below), whose sum is σ = 123584692. Its totient is φ = 123518592.

The previous prime is 123551611. The next prime is 123551671. The reversal of 123551641 is 146155321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 146155321 = 13 ⋅11242717.

It is an interprime number because it is at equal distance from previous prime (123551611) and next prime (123551671).

It can be written as a sum of positive squares in 2 ways, for example, as 94012416 + 29539225 = 9696^2 + 5435^2 .

It is a cyclic number.

It is not a de Polignac number, because 123551641 - 2¹⁵ = 123518873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123551611) 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, 10080 + ... + 18673.

It is an arithmetic number, because the mean of its divisors is an integer number (30896173).

Almost surely, 2^123551641 is an apocalyptic number.

It is an amenable number.

123551641 is a deficient number, since it is larger than the sum of its proper divisors (33051).

123551641 is an equidigital number, since it uses as much as digits as its factorization.

123551641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33050.

The product of its digits is 3600, while the sum is 28.

The square root of 123551641 is about 11115.3785810471. The cubic root of 123551641 is about 498.0613476356.

The spelling of 123551641 in words is "one hundred twenty-three million, five hundred fifty-one thousand, six hundred forty-one".