261341645 has 8 divisors (see below), whose sum is σ = 313751904. Its totient is φ = 208978704.

The previous prime is 261341627. The next prime is 261341653. The reversal of 261341645 is 546143162.

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 261341645 - 2⁶ = 261341581 is a prime.

It is a super-3 number, since 3×261341645³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

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, 1742 + ... + 22928.

It is an arithmetic number, because the mean of its divisors is an integer number (39218988).

Almost surely, 2^261341645 is an apocalyptic number.

It is an amenable number.

261341645 is a deficient number, since it is larger than the sum of its proper divisors (52410259).

261341645 is a wasteful number, since it uses less digits than its factorization.

261341645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23659.

The product of its digits is 17280, while the sum is 32.

The square root of 261341645 is about 16166.0646107827. The cubic root of 261341645 is about 639.3463745156.

The spelling of 261341645 in words is "two hundred sixty-one million, three hundred forty-one thousand, six hundred forty-five".