261335471 has 2 divisors, whose sum is σ = 261335472. Its totient is φ = 261335470.

The previous prime is 261335419. The next prime is 261335479. The reversal of 261335471 is 174533162.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261335471 is a prime.

It is a super-3 number, since 3×261335471³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261335479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130667735 + 130667736.

It is an arithmetic number, because the mean of its divisors is an integer number (130667736).

Almost surely, 2^261335471 is an apocalyptic number.

261335471 is a deficient number, since it is larger than the sum of its proper divisors (1).

261335471 is an equidigital number, since it uses as much as digits as its factorization.

261335471 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15120, while the sum is 32.

The square root of 261335471 is about 16165.8736540900. The cubic root of 261335471 is about 639.3413397834.

The spelling of 261335471 in words is "two hundred sixty-one million, three hundred thirty-five thousand, four hundred seventy-one".