261123727 has 4 divisors (see below), whose sum is σ = 264269880. Its totient is φ = 257977576.

The previous prime is 261123721. The next prime is 261123809. The reversal of 261123727 is 727321162.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 727321162 = 2 ⋅363660581.

It is a cyclic number.

It is not a de Polignac number, because 261123727 - 2³ = 261123719 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 (261123721) 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, 1572952 + ... + 1573117.

It is an arithmetic number, because the mean of its divisors is an integer number (66067470).

Almost surely, 2^261123727 is an apocalyptic number.

261123727 is a deficient number, since it is larger than the sum of its proper divisors (3146153).

261123727 is an equidigital number, since it uses as much as digits as its factorization.

261123727 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3146152.

The product of its digits is 7056, while the sum is 31.

The square root of 261123727 is about 16159.3232222145. The cubic root of 261123727 is about 639.1686201866.

Adding to 261123727 its reverse (727321162), we get a palindrome (988444889).

The spelling of 261123727 in words is "two hundred sixty-one million, one hundred twenty-three thousand, seven hundred twenty-seven".