261144001 has 8 divisors (see below), whose sum is σ = 273510144. Its totient is φ = 248862240.

The previous prime is 261143983. The next prime is 261144007. The reversal of 261144001 is 100441162.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 261144001 - 2⁷ = 261143873 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 261144001.

It is not an unprimeable number, because it can be changed into a prime (261144007) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14716 + ... + 27181.

It is an arithmetic number, because the mean of its divisors is an integer number (34188768).

Almost surely, 2^261144001 is an apocalyptic number.

It is an amenable number.

261144001 is a deficient number, since it is larger than the sum of its proper divisors (12366143).

261144001 is a wasteful number, since it uses less digits than its factorization.

261144001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42191.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 261144001 is about 16159.9505259144. The cubic root of 261144001 is about 639.1851617311.

Adding to 261144001 its reverse (100441162), we get a palindrome (361585163).

The spelling of 261144001 in words is "two hundred sixty-one million, one hundred forty-four thousand, one".