261047153 has 2 divisors, whose sum is σ = 261047154. Its totient is φ = 261047152.

The previous prime is 261047141. The next prime is 261047167. The reversal of 261047153 is 351740162.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 250367329 + 10679824 = 15823^2 + 3268^2 .

It is a cyclic number.

It is not a de Polignac number, because 261047153 - 2⁶ = 261047089 is a prime.

It is not a weakly prime, because it can be changed into another prime (261047653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130523576 + 130523577.

It is an arithmetic number, because the mean of its divisors is an integer number (130523577).

Almost surely, 2^261047153 is an apocalyptic number.

It is an amenable number.

261047153 is a deficient number, since it is larger than the sum of its proper divisors (1).

261047153 is an equidigital number, since it uses as much as digits as its factorization.

261047153 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 261047153 is about 16156.9537042105. The cubic root of 261047153 is about 639.1061357806.

The spelling of 261047153 in words is "two hundred sixty-one million, forty-seven thousand, one hundred fifty-three".