261335047 has 2 divisors, whose sum is σ = 261335048. Its totient is φ = 261335046.

The previous prime is 261335027. The next prime is 261335057. The reversal of 261335047 is 740533162.

261335047 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261335047 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, 130667523 + 130667524.

It is an arithmetic number, because the mean of its divisors is an integer number (130667524).

Almost surely, 2^261335047 is an apocalyptic number.

261335047 is a deficient number, since it is larger than the sum of its proper divisors (1).

261335047 is an equidigital number, since it uses as much as digits as its factorization.

261335047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15120, while the sum is 31.

The square root of 261335047 is about 16165.8605400393. The cubic root of 261335047 is about 639.3409940198.

It can be divided in two parts, 2613 and 35047, that multiplied together give a triangular number (91577811 = T₁₃₅₃₃).

The spelling of 261335047 in words is "two hundred sixty-one million, three hundred thirty-five thousand, forty-seven".