261324001 has 4 divisors (see below), whose sum is σ = 261529600. Its totient is φ = 261118404.

The previous prime is 261323987. The next prime is 261324047. The reversal of 261324001 is 100423162.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 261324001 - 2¹⁷ = 261192929 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 261324001.

It is not an unprimeable number, because it can be changed into a prime (261324071) 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, 100881 + ... + 103438.

It is an arithmetic number, because the mean of its divisors is an integer number (65382400).

Almost surely, 2^261324001 is an apocalyptic number.

It is an amenable number.

261324001 is a deficient number, since it is larger than the sum of its proper divisors (205599).

261324001 is a wasteful number, since it uses less digits than its factorization.

261324001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205598.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 261324001 is about 16165.5188905275. The cubic root of 261324001 is about 639.3319860940.

Adding to 261324001 its reverse (100423162), we get a palindrome (361747163).

The spelling of 261324001 in words is "two hundred sixty-one million, three hundred twenty-four thousand, one".