261588893 has 2 divisors, whose sum is σ = 261588894. Its totient is φ = 261588892.

The previous prime is 261588841. The next prime is 261588931. The reversal of 261588893 is 398885162.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 181629529 + 79959364 = 13477^2 + 8942^2 .

It is a cyclic number.

It is not a de Polignac number, because 261588893 - 2¹⁸ = 261326749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261588493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130794446 + 130794447.

It is an arithmetic number, because the mean of its divisors is an integer number (130794447).

Almost surely, 2^261588893 is an apocalyptic number.

It is an amenable number.

261588893 is a deficient number, since it is larger than the sum of its proper divisors (1).

261588893 is an equidigital number, since it uses as much as digits as its factorization.

261588893 is an evil number, because the sum of its binary digits is even.

The product of its digits is 829440, while the sum is 50.

The square root of 261588893 is about 16173.7099330982. The cubic root of 261588893 is about 639.5479335232.

The spelling of 261588893 in words is "two hundred sixty-one million, five hundred eighty-eight thousand, eight hundred ninety-three".