261123359 has 4 divisors (see below), whose sum is σ = 298426704. Its totient is φ = 223820016.

The previous prime is 261123311. The next prime is 261123367. The reversal of 261123359 is 953321162.

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

It is a de Polignac number, because none of the positive numbers 2^k-261123359 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261123559) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18651662 + ... + 18651675.

It is an arithmetic number, because the mean of its divisors is an integer number (74606676).

Almost surely, 2^261123359 is an apocalyptic number.

261123359 is a deficient number, since it is larger than the sum of its proper divisors (37303345).

261123359 is an equidigital number, since it uses as much as digits as its factorization.

261123359 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37303344.

The product of its digits is 9720, while the sum is 32.

The square root of 261123359 is about 16159.3118355950. The cubic root of 261123359 is about 639.1683199277.

The spelling of 261123359 in words is "two hundred sixty-one million, one hundred twenty-three thousand, three hundred fifty-nine".