261411623 has 16 divisors (see below), whose sum is σ = 302346240. Its totient is φ = 223754400.

The previous prime is 261411617. The next prime is 261411637. The reversal of 261411623 is 326114162.

It is a cyclic number.

It is not a de Polignac number, because 261411623 - 2⁴ = 261411607 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 261411592 and 261411601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261411673) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2258 + ... + 22976.

It is an arithmetic number, because the mean of its divisors is an integer number (18896640).

Almost surely, 2^261411623 is an apocalyptic number.

261411623 is a deficient number, since it is larger than the sum of its proper divisors (40934617).

261411623 is a wasteful number, since it uses less digits than its factorization.

261411623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20798.

The product of its digits is 1728, while the sum is 26.

The square root of 261411623 is about 16168.2288145610. The cubic root of 261411623 is about 639.4034341650.

Adding to 261411623 its reverse (326114162), we get a palindrome (587525785).

The spelling of 261411623 in words is "two hundred sixty-one million, four hundred eleven thousand, six hundred twenty-three".