261435953 has 8 divisors (see below), whose sum is σ = 275363520. Its totient is φ = 247525200.

The previous prime is 261435947. The next prime is 261435961. The reversal of 261435953 is 359534162.

261435953 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 a cyclic number.

It is not a de Polignac number, because 261435953 - 2¹⁴ = 261419569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261435353) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39428 + ... + 45578.

It is an arithmetic number, because the mean of its divisors is an integer number (34420440).

Almost surely, 2^261435953 is an apocalyptic number.

It is an amenable number.

261435953 is a deficient number, since it is larger than the sum of its proper divisors (13927567).

261435953 is a wasteful number, since it uses less digits than its factorization.

261435953 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8407.

The product of its digits is 97200, while the sum is 38.

The square root of 261435953 is about 16168.9811985790. The cubic root of 261435953 is about 639.4232703182.

The spelling of 261435953 in words is "two hundred sixty-one million, four hundred thirty-five thousand, nine hundred fifty-three".