261132881 has 2 divisors, whose sum is σ = 261132882. Its totient is φ = 261132880.

The previous prime is 261132821. The next prime is 261132901. The reversal of 261132881 is 188231162.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 261113281 + 19600 = 16159^2 + 140^2 .

It is a cyclic number.

It is not a de Polignac number, because 261132881 - 2¹⁴ = 261116497 is a prime.

It is a super-2 number, since 2×261132881² = 136380763078720322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (261132821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130566440 + 130566441.

It is an arithmetic number, because the mean of its divisors is an integer number (130566441).

Almost surely, 2^261132881 is an apocalyptic number.

It is an amenable number.

261132881 is a deficient number, since it is larger than the sum of its proper divisors (1).

261132881 is an equidigital number, since it uses as much as digits as its factorization.

261132881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4608, while the sum is 32.

The square root of 261132881 is about 16159.6064617923. The cubic root of 261132881 is about 639.1760890357.

The spelling of 261132881 in words is "two hundred sixty-one million, one hundred thirty-two thousand, eight hundred eighty-one".