261352553 has 16 divisors (see below), whose sum is σ = 337080960. Its totient is φ = 196627200.

The previous prime is 261352499. The next prime is 261352589. The reversal of 261352553 is 355253162.

It is not a de Polignac number, because 261352553 - 2¹² = 261348457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261354553) 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 15 ways as a sum of consecutive naturals, for example, 56288 + ... + 60753.

It is an arithmetic number, because the mean of its divisors is an integer number (21067560).

Almost surely, 2^261352553 is an apocalyptic number.

It is an amenable number.

261352553 is a deficient number, since it is larger than the sum of its proper divisors (75728407).

261352553 is a wasteful number, since it uses less digits than its factorization.

261352553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117088.

The product of its digits is 27000, while the sum is 32.

The square root of 261352553 is about 16166.4019806511. The cubic root of 261352553 is about 639.3552695047.

The spelling of 261352553 in words is "two hundred sixty-one million, three hundred fifty-two thousand, five hundred fifty-three".