261136023 has 4 divisors (see below), whose sum is σ = 348181368. Its totient is φ = 174090680.

The previous prime is 261136021. The next prime is 261136027. The reversal of 261136023 is 320631162.

It is a happy number.

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 261136023 - 2¹ = 261136021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 261135984 and 261136002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261136021) 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, 43522668 + ... + 43522673.

It is an arithmetic number, because the mean of its divisors is an integer number (87045342).

Almost surely, 2^261136023 is an apocalyptic number.

261136023 is a deficient number, since it is larger than the sum of its proper divisors (87045345).

261136023 is an equidigital number, since it uses as much as digits as its factorization.

261136023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87045344.

The product of its (nonzero) digits is 1296, while the sum is 24.

The square root of 261136023 is about 16159.7036792139. The cubic root of 261136023 is about 639.1786525878.

Adding to 261136023 its reverse (320631162), we get a palindrome (581767185).

The spelling of 261136023 in words is "two hundred sixty-one million, one hundred thirty-six thousand, twenty-three".