261434253 has 16 divisors (see below), whose sum is σ = 360444416. Its totient is φ = 168376320.

The previous prime is 261434237. The next prime is 261434263. The reversal of 261434253 is 352434162.

It is not a de Polignac number, because 261434253 - 2⁴ = 261434237 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 261434253.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261434263) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60501 + ... + 64677.

It is an arithmetic number, because the mean of its divisors is an integer number (22527776).

Almost surely, 2^261434253 is an apocalyptic number.

It is an amenable number.

261434253 is a deficient number, since it is larger than the sum of its proper divisors (99010163).

261434253 is a wasteful number, since it uses less digits than its factorization.

261434253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4884.

The product of its digits is 17280, while the sum is 30.

The square root of 261434253 is about 16168.9286287002. The cubic root of 261434253 is about 639.4218843548.

Subtracting 261434253 from its reverse (352434162), we obtain a palindrome (90999909).

The spelling of 261434253 in words is "two hundred sixty-one million, four hundred thirty-four thousand, two hundred fifty-three".