261420353 has 4 divisors (see below), whose sum is σ = 261789780. Its totient is φ = 261050928.

The previous prime is 261420347. The next prime is 261420361. The reversal of 261420353 is 353024162.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 353024162 = 2 ⋅176512081.

It can be written as a sum of positive squares in 2 ways, for example, as 33500944 + 227919409 = 5788^2 + 15097^2 .

It is a cyclic number.

It is not a de Polignac number, because 261420353 - 2⁴ = 261420337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261440353) 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, 183650 + ... + 185067.

It is an arithmetic number, because the mean of its divisors is an integer number (65447445).

Almost surely, 2^261420353 is an apocalyptic number.

It is an amenable number.

261420353 is a deficient number, since it is larger than the sum of its proper divisors (369427).

261420353 is an equidigital number, since it uses as much as digits as its factorization.

261420353 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 369426.

The product of its (nonzero) digits is 4320, while the sum is 26.

The square root of 261420353 is about 16168.4987862201. The cubic root of 261420353 is about 639.4105518412.

The spelling of 261420353 in words is "two hundred sixty-one million, four hundred twenty thousand, three hundred fifty-three".