261049965 has 32 divisors (see below), whose sum is σ = 458220672. Its totient is φ = 125856000.

The previous prime is 261049961. The next prime is 261050003. The reversal of 261049965 is 569940162.

It is a happy number.

It is not a de Polignac number, because 261049965 - 2² = 261049961 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261049961) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25495 + ... + 34235.

It is an arithmetic number, because the mean of its divisors is an integer number (14319396).

Almost surely, 2^261049965 is an apocalyptic number.

It is an amenable number.

261049965 is a deficient number, since it is larger than the sum of its proper divisors (197170707).

261049965 is a wasteful number, since it uses less digits than its factorization.

261049965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8941.

The product of its (nonzero) digits is 116640, while the sum is 42.

The square root of 261049965 is about 16157.0407253309. The cubic root of 261049965 is about 639.1084305895.

The spelling of 261049965 in words is "two hundred sixty-one million, forty-nine thousand, nine hundred sixty-five".