261010623 has 4 divisors (see below), whose sum is σ = 348014168. Its totient is φ = 174007080.

The previous prime is 261010609. The next prime is 261010649. The reversal of 261010623 is 326010162.

It is a happy number.

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

It is not a de Polignac number, because 261010623 - 2²⁵ = 227456191 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 261010623.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261010663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43501768 + ... + 43501773.

It is an arithmetic number, because the mean of its divisors is an integer number (87003542).

Almost surely, 2^261010623 is an apocalyptic number.

261010623 is a deficient number, since it is larger than the sum of its proper divisors (87003545).

261010623 is an equidigital number, since it uses as much as digits as its factorization.

261010623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87003544.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 261010623 is about 16155.8231916545. The cubic root of 261010623 is about 639.0763229850.

Adding to 261010623 its reverse (326010162), we get a palindrome (587020785).

The spelling of 261010623 in words is "two hundred sixty-one million, ten thousand, six hundred twenty-three".