261352545 has 8 divisors (see below), whose sum is σ = 418164096. Its totient is φ = 139388016.

The previous prime is 261352499. The next prime is 261352589. The reversal of 261352545 is 545253162.

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

It is not a de Polignac number, because 261352545 - 2¹⁰ = 261351521 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax 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, 8711737 + ... + 8711766.

It is an arithmetic number, because the mean of its divisors is an integer number (52270512).

Almost surely, 2^261352545 is an apocalyptic number.

It is an amenable number.

261352545 is a deficient number, since it is larger than the sum of its proper divisors (156811551).

261352545 is a wasteful number, since it uses less digits than its factorization.

261352545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17423511.

The product of its digits is 36000, while the sum is 33.

The square root of 261352545 is about 16166.4017332244. The cubic root of 261352545 is about 639.3552629811.

It can be divided in two parts, 26135 and 2545, that added together give a triangular number (28680 = T₂₃₉).

The spelling of 261352545 in words is "two hundred sixty-one million, three hundred fifty-two thousand, five hundred forty-five".