261071147 has 2 divisors, whose sum is σ = 261071148. Its totient is φ = 261071146.

The previous prime is 261071143. The next prime is 261071171. The reversal of 261071147 is 741170162.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 261071147 - 2² = 261071143 is a prime.

It is not a weakly prime, because it can be changed into another prime (261071143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130535573 + 130535574.

It is an arithmetic number, because the mean of its divisors is an integer number (130535574).

Almost surely, 2^261071147 is an apocalyptic number.

261071147 is a deficient number, since it is larger than the sum of its proper divisors (1).

261071147 is an equidigital number, since it uses as much as digits as its factorization.

261071147 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2352, while the sum is 29.

The square root of 261071147 is about 16157.6962157357. The cubic root of 261071147 is about 639.1257162058.

The spelling of 261071147 in words is "two hundred sixty-one million, seventy-one thousand, one hundred forty-seven".