261471953 has 4 divisors (see below), whose sum is σ = 261941940. Its totient is φ = 261001968.

The previous prime is 261471929. The next prime is 261471967. The reversal of 261471953 is 359174162.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 55606849 + 205865104 = 7457^2 + 14348^2 .

It is a cyclic number.

It is not a de Polignac number, because 261471953 - 2⁸ = 261471697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261471983) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 234158 + ... + 235271.

It is an arithmetic number, because the mean of its divisors is an integer number (65485485).

Almost surely, 2^261471953 is an apocalyptic number.

It is an amenable number.

261471953 is a deficient number, since it is larger than the sum of its proper divisors (469987).

261471953 is an equidigital number, since it uses as much as digits as its factorization.

261471953 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 469986.

The product of its digits is 45360, while the sum is 38.

The square root of 261471953 is about 16170.0944029403. The cubic root of 261471953 is about 639.4526187187.

The spelling of 261471953 in words is "two hundred sixty-one million, four hundred seventy-one thousand, nine hundred fifty-three".