3261561401 has 8 divisors (see below), whose sum is σ = 3946763520. Its totient is φ = 2631175488.

The previous prime is 3261561389. The next prime is 3261561403. The reversal of 3261561401 is 1041651623.

It is a happy number.

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 3261561401 - 2¹⁴ = 3261545017 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3261561403) 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 7 ways as a sum of consecutive naturals, for example, 13703921 + ... + 13704158.

It is an arithmetic number, because the mean of its divisors is an integer number (493345440).

Almost surely, 2^3261561401 is an apocalyptic number.

It is an amenable number.

3261561401 is a deficient number, since it is larger than the sum of its proper divisors (685202119).

3261561401 is a wasteful number, since it uses less digits than its factorization.

3261561401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27408103.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 3261561401 is about 57110.0814305145. The cubic root of 3261561401 is about 1483.0023968313.

The spelling of 3261561401 in words is "three billion, two hundred sixty-one million, five hundred sixty-one thousand, four hundred one".