261088897 has 2 divisors, whose sum is σ = 261088898. Its totient is φ = 261088896.

The previous prime is 261088889. The next prime is 261088921. The reversal of 261088897 is 798880162.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 226231681 + 34857216 = 15041^2 + 5904^2 .

It is a cyclic number.

It is not a de Polignac number, because 261088897 - 2³ = 261088889 is a prime.

It is a super-3 number, since 3×261088897³ (a number of 26 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 261088897.

It is not a weakly prime, because it can be changed into another prime (261088837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130544448 + 130544449.

It is an arithmetic number, because the mean of its divisors is an integer number (130544449).

Almost surely, 2^261088897 is an apocalyptic number.

It is an amenable number.

261088897 is a deficient number, since it is larger than the sum of its proper divisors (1).

261088897 is an equidigital number, since it uses as much as digits as its factorization.

261088897 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 387072, while the sum is 49.

The square root of 261088897 is about 16158.2454802494. The cubic root of 261088897 is about 639.1402004113.

The spelling of 261088897 in words is "two hundred sixty-one million, eighty-eight thousand, eight hundred ninety-seven".