123164557 has 4 divisors (see below), whose sum is σ = 123189660. Its totient is φ = 123139456.

The previous prime is 123164521. The next prime is 123164567. The reversal of 123164557 is 755461321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 755461321 = 5189 ⋅145589.

It can be written as a sum of positive squares in 2 ways, for example, as 68906601 + 54257956 = 8301^2 + 7366^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123164557 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 (123164567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2518 + ... + 15895.

It is an arithmetic number, because the mean of its divisors is an integer number (30797415).

Almost surely, 2^123164557 is an apocalyptic number.

It is an amenable number.

123164557 is a deficient number, since it is larger than the sum of its proper divisors (25103).

123164557 is an equidigital number, since it uses as much as digits as its factorization.

123164557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25102.

The product of its digits is 25200, while the sum is 34.

The square root of 123164557 is about 11097.9528292384. The cubic root of 123164557 is about 497.5406658509.

The spelling of 123164557 in words is "one hundred twenty-three million, one hundred sixty-four thousand, five hundred fifty-seven".