324155681 has 4 divisors (see below), whose sum is σ = 324374292. Its totient is φ = 323937072.

The previous prime is 324155669. The next prime is 324155687. The reversal of 324155681 is 186551423.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 186551423 = 263 ⋅709321.

It can be written as a sum of positive squares in 2 ways, for example, as 164891281 + 159264400 = 12841^2 + 12620^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-324155681 is a prime.

It is a super-2 number, since 2×324155681² = 210153811049147522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (324155687) 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, 107066 + ... + 110051.

It is an arithmetic number, because the mean of its divisors is an integer number (81093573).

Almost surely, 2^324155681 is an apocalyptic number.

It is an amenable number.

324155681 is a deficient number, since it is larger than the sum of its proper divisors (218611).

324155681 is a wasteful number, since it uses less digits than its factorization.

324155681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218610.

The product of its digits is 28800, while the sum is 35.

The square root of 324155681 is about 18004.3239528731. The cubic root of 324155681 is about 686.9385342496.

The spelling of 324155681 in words is "three hundred twenty-four million, one hundred fifty-five thousand, six hundred eighty-one".