261000745 has 16 divisors (see below), whose sum is σ = 332252928. Its totient is φ = 196145920.

The previous prime is 261000737. The next prime is 261000781. The reversal of 261000745 is 547000162.

It is not a de Polignac number, because 261000745 - 2³ = 261000737 is a prime.

It is a super-3 number, since 3×261000745³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47280 + ... + 52510.

It is an arithmetic number, because the mean of its divisors is an integer number (20765808).

Almost surely, 2^261000745 is an apocalyptic number.

It is an amenable number.

261000745 is a deficient number, since it is larger than the sum of its proper divisors (71252183).

261000745 is a wasteful number, since it uses less digits than its factorization.

261000745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5840.

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 261000745 is about 16155.5174785582. The cubic root of 261000745 is about 639.0682608922.

The spelling of 261000745 in words is "two hundred sixty-one million, seven hundred forty-five", and thus it is an aban number.