261335023 has 2 divisors, whose sum is σ = 261335024. Its totient is φ = 261335022.

The previous prime is 261334961. The next prime is 261335027. The reversal of 261335023 is 320533162.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261335023 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261335027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130667511 + 130667512.

It is an arithmetic number, because the mean of its divisors is an integer number (130667512).

Almost surely, 2^261335023 is an apocalyptic number.

261335023 is a deficient number, since it is larger than the sum of its proper divisors (1).

261335023 is an equidigital number, since it uses as much as digits as its factorization.

261335023 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3240, while the sum is 25.

The square root of 261335023 is about 16165.8597977342. The cubic root of 261335023 is about 639.3409744483.

Adding to 261335023 its reverse (320533162), we get a palindrome (581868185).

It can be divided in two parts, 2613 and 35023, that added together give a square (37636 = 194²).

The spelling of 261335023 in words is "two hundred sixty-one million, three hundred thirty-five thousand, twenty-three".