261102001 has 4 divisors (see below), whose sum is σ = 261286912. Its totient is φ = 260917092.

The previous prime is 261101999. The next prime is 261102011. The reversal of 261102001 is 100201162.

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 261102001 - 2¹ = 261101999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261102011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90321 + ... + 93166.

It is an arithmetic number, because the mean of its divisors is an integer number (65321728).

Almost surely, 2^261102001 is an apocalyptic number.

It is an amenable number.

261102001 is a deficient number, since it is larger than the sum of its proper divisors (184911).

261102001 is a wasteful number, since it uses less digits than its factorization.

261102001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184910.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 261102001 is about 16158.6509647309. The cubic root of 261102001 is about 639.1508930057.

Adding to 261102001 its reverse (100201162), we get a palindrome (361303163).

The spelling of 261102001 in words is "two hundred sixty-one million, one hundred two thousand, one".