261204529 has 2 divisors, whose sum is σ = 261204530. Its totient is φ = 261204528.

The previous prime is 261204523. The next prime is 261204551. The reversal of 261204529 is 925402162.

261204529 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 206784400 + 54420129 = 14380^2 + 7377^2 .

It is a cyclic number.

It is not a de Polignac number, because 261204529 - 2⁷ = 261204401 is a prime.

It is a super-2 number, since 2×261204529² = 136455611940223682, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 261204529.

It is not a weakly prime, because it can be changed into another prime (261204523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130602264 + 130602265.

It is an arithmetic number, because the mean of its divisors is an integer number (130602265).

Almost surely, 2^261204529 is an apocalyptic number.

It is an amenable number.

261204529 is a deficient number, since it is larger than the sum of its proper divisors (1).

261204529 is an equidigital number, since it uses as much as digits as its factorization.

261204529 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 261204529 is about 16161.8231954195. The cubic root of 261204529 is about 639.2345413972.

The spelling of 261204529 in words is "two hundred sixty-one million, two hundred four thousand, five hundred twenty-nine".