261001445 has 8 divisors (see below), whose sum is σ = 314133144. Its totient is φ = 208180224.

The previous prime is 261001409. The next prime is 261001469. The reversal of 261001445 is 544100162.

It can be written as a sum of positive squares in 4 ways, for example, as 49729 + 260951716 = 223^2 + 16154^2 .

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 261001445 - 2¹⁸ = 260739301 is a prime.

It is a super-3 number, since 3×261001445³ (a number of 26 digits) contains 333 as substring.

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 261001445.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75764 + ... + 79133.

It is an arithmetic number, because the mean of its divisors is an integer number (39266643).

Almost surely, 2^261001445 is an apocalyptic number.

It is an amenable number.

261001445 is a deficient number, since it is larger than the sum of its proper divisors (53131699).

261001445 is a wasteful number, since it uses less digits than its factorization.

261001445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155239.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 261001445 is about 16155.5391429689. The cubic root of 261001445 is about 639.0688322155.

The spelling of 261001445 in words is "two hundred sixty-one million, one thousand, four hundred forty-five".