261000653 has 4 divisors (see below), whose sum is σ = 262602048. Its totient is φ = 259399260.

The previous prime is 261000647. The next prime is 261000659. The reversal of 261000653 is 356000162.

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 an interprime number because it is at equal distance from previous prime (261000647) and next prime (261000659).

It is a cyclic number.

It is not a de Polignac number, because 261000653 - 2²⁴ = 244223437 is a prime.

It is a super-3 number, since 3×261000653³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261000659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 800453 + ... + 800778.

It is an arithmetic number, because the mean of its divisors is an integer number (65650512).

Almost surely, 2^261000653 is an apocalyptic number.

It is an amenable number.

261000653 is a deficient number, since it is larger than the sum of its proper divisors (1601395).

261000653 is a wasteful number, since it uses less digits than its factorization.

261000653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1601394.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 261000653 is about 16155.5146312335. The cubic root of 261000653 is about 639.0681858040.

The spelling of 261000653 in words is "two hundred sixty-one million, six hundred fifty-three", and thus it is an aban number.