261352523 has 4 divisors (see below), whose sum is σ = 261706920. Its totient is φ = 260998128.

The previous prime is 261352499. The next prime is 261352589. The reversal of 261352523 is 325253162.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 261352523 - 2²⁰ = 260303947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261358523) 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, 176090 + ... + 177567.

It is an arithmetic number, because the mean of its divisors is an integer number (65426730).

Almost surely, 2^261352523 is an apocalyptic number.

261352523 is a deficient number, since it is larger than the sum of its proper divisors (354397).

261352523 is an equidigital number, since it uses as much as digits as its factorization.

261352523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 354396.

The product of its digits is 10800, while the sum is 29.

The square root of 261352523 is about 16166.4010528008. The cubic root of 261352523 is about 639.3552450414.

The spelling of 261352523 in words is "two hundred sixty-one million, three hundred fifty-two thousand, five hundred twenty-three".