261443471 has 2 divisors, whose sum is σ = 261443472. Its totient is φ = 261443470.

The previous prime is 261443453. The next prime is 261443489. The reversal of 261443471 is 174344162.

It is a balanced prime because it is at equal distance from previous prime (261443453) and next prime (261443489).

It is a cyclic number.

It is not a de Polignac number, because 261443471 - 2⁶ = 261443407 is a prime.

It is a super-3 number, since 3×261443471³ (a number of 26 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261443411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130721735 + 130721736.

It is an arithmetic number, because the mean of its divisors is an integer number (130721736).

Almost surely, 2^261443471 is an apocalyptic number.

261443471 is a deficient number, since it is larger than the sum of its proper divisors (1).

261443471 is an equidigital number, since it uses as much as digits as its factorization.

261443471 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16128, while the sum is 32.

The square root of 261443471 is about 16169.2136790878. The cubic root of 261443471 is about 639.4293994650.

The spelling of 261443471 in words is "two hundred sixty-one million, four hundred forty-three thousand, four hundred seventy-one".