240561145 has 32 divisors (see below), whose sum is σ = 325938816. Its totient is φ = 168921600.

The previous prime is 240561137. The next prime is 240561157. The reversal of 240561145 is 541165042.

240561145 is a nontrivial binomial coefficient, being equal to C(21935, 2).

It is not a de Polignac number, because 240561145 - 2³ = 240561137 is a prime.

It is a super-2 number, since 2×240561145² = 115739328967422050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 240787 + ... + 241783.

It is an arithmetic number, because the mean of its divisors is an integer number (10185588).

Almost surely, 2^240561145 is an apocalyptic number.

240561145 is the 21934-th triangular number.

240561145 is the 7312-nd centered nonagonal number.

It is an amenable number.

240561145 is a deficient number, since it is larger than the sum of its proper divisors (85377671).

240561145 is a wasteful number, since it uses less digits than its factorization.

240561145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1161.

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 240561145 is about 15510.0336879067. The cubic root of 240561145 is about 621.9304597559.

The spelling of 240561145 in words is "two hundred forty million, five hundred sixty-one thousand, one hundred forty-five".