261131047 has 2 divisors, whose sum is σ = 261131048. Its totient is φ = 261131046.

The previous prime is 261131027. The next prime is 261131063. The reversal of 261131047 is 740131162.

261131047 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 not a de Polignac number, because 261131047 - 2²³ = 252742439 is a prime.

It is equal to p_14254261 and since 261131047 and 14254261 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261131027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130565523 + 130565524.

It is an arithmetic number, because the mean of its divisors is an integer number (130565524).

Almost surely, 2^261131047 is an apocalyptic number.

261131047 is a deficient number, since it is larger than the sum of its proper divisors (1).

261131047 is an equidigital number, since it uses as much as digits as its factorization.

261131047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 261131047 is about 16159.5497152613. The cubic root of 261131047 is about 639.1745926689.

The spelling of 261131047 in words is "two hundred sixty-one million, one hundred thirty-one thousand, forty-seven".