261329545 has 8 divisors (see below), whose sum is σ = 313689600. Its totient is φ = 209000880.

The previous prime is 261329539. The next prime is 261329569. The reversal of 261329545 is 545923162.

261329545 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 261329545 - 2¹⁷ = 261198473 is a prime.

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, 18550 + ... + 29440.

It is an arithmetic number, because the mean of its divisors is an integer number (39211200).

Almost surely, 2^261329545 is an apocalyptic number.

It is an amenable number.

261329545 is a deficient number, since it is larger than the sum of its proper divisors (52360055).

261329545 is a wasteful number, since it uses less digits than its factorization.

261329545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15695.

The product of its digits is 64800, while the sum is 37.

The square root of 261329545 is about 16165.6903657097. The cubic root of 261329545 is about 639.3365072140.

The spelling of 261329545 in words is "two hundred sixty-one million, three hundred twenty-nine thousand, five hundred forty-five".