261542353 has 4 divisors (see below), whose sum is σ = 275307760. Its totient is φ = 247776948.

The previous prime is 261542311. The next prime is 261542447. The reversal of 261542353 is 353245162.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 261542353 - 2¹⁷ = 261411281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261542153) 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, 6882675 + ... + 6882712.

It is an arithmetic number, because the mean of its divisors is an integer number (68826940).

Almost surely, 2^261542353 is an apocalyptic number.

It is an amenable number.

261542353 is a deficient number, since it is larger than the sum of its proper divisors (13765407).

261542353 is a wasteful number, since it uses less digits than its factorization.

261542353 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13765406.

The product of its digits is 21600, while the sum is 31.

The square root of 261542353 is about 16172.2711144725. The cubic root of 261542353 is about 639.5100033626.

The spelling of 261542353 in words is "two hundred sixty-one million, five hundred forty-two thousand, three hundred fifty-three".