261113553 has 12 divisors (see below), whose sum is σ = 377589888. Its totient is φ = 173879160.

The previous prime is 261113537. The next prime is 261113569. The reversal of 261113553 is 355311162.

It is an interprime number because it is at equal distance from previous prime (261113537) and next prime (261113569).

It is not a de Polignac number, because 261113553 - 2⁴ = 261113537 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261113513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7725 + ... + 24122.

It is an arithmetic number, because the mean of its divisors is an integer number (31465824).

Almost surely, 2^261113553 is an apocalyptic number.

It is an amenable number.

261113553 is a deficient number, since it is larger than the sum of its proper divisors (116476335).

261113553 is a wasteful number, since it uses less digits than its factorization.

261113553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32764 (or 32761 counting only the distinct ones).

The product of its digits is 2700, while the sum is 27.

The square root of 261113553 is about 16159.0084163602. The cubic root of 261113553 is about 639.1603189034.

The spelling of 261113553 in words is "two hundred sixty-one million, one hundred thirteen thousand, five hundred fifty-three".