261442723 has 2 divisors, whose sum is σ = 261442724. Its totient is φ = 261442722.

The previous prime is 261442637. The next prime is 261442729. The reversal of 261442723 is 327244162.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 261442723 - 2⁹ = 261442211 is a prime.

It is not a weakly prime, because it can be changed into another prime (261442729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130721361 + 130721362.

It is an arithmetic number, because the mean of its divisors is an integer number (130721362).

Almost surely, 2^261442723 is an apocalyptic number.

261442723 is a deficient number, since it is larger than the sum of its proper divisors (1).

261442723 is an equidigital number, since it uses as much as digits as its factorization.

261442723 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16128, while the sum is 31.

The square root of 261442723 is about 16169.1905486948. The cubic root of 261442723 is about 639.4287896536.

Adding to 261442723 its reverse (327244162), we get a palindrome (588686885).

The spelling of 261442723 in words is "two hundred sixty-one million, four hundred forty-two thousand, seven hundred twenty-three".