261453533 has 6 divisors (see below), whose sum is σ = 287382942. Its totient is φ = 237684920.

The previous prime is 261453487. The next prime is 261453541. The reversal of 261453533 is 335354162.

It can be written as a sum of positive squares in only one way, i.e., 180687364 + 80766169 = 13442^2 + 8987^2 .

It is a de Polignac number, because none of the positive numbers 2^k-261453533 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 261453533.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261453583) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1080266 + ... + 1080507.

It is an arithmetic number, because the mean of its divisors is an integer number (47897157).

Almost surely, 2^261453533 is an apocalyptic number.

It is an amenable number.

261453533 is a deficient number, since it is larger than the sum of its proper divisors (25929409).

261453533 is a wasteful number, since it uses less digits than its factorization.

261453533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2160795 (or 2160784 counting only the distinct ones).

The product of its digits is 32400, while the sum is 32.

The square root of 261453533 is about 16169.5248229501. The cubic root of 261453533 is about 639.4376024570.

The spelling of 261453533 in words is "two hundred sixty-one million, four hundred fifty-three thousand, five hundred thirty-three".