261059231 has 2 divisors, whose sum is σ = 261059232. Its totient is φ = 261059230.

The previous prime is 261059171. The next prime is 261059233. The reversal of 261059231 is 132950162.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261059231 is a prime.

It is a super-2 number, since 2×261059231² = 136303844180622722, which contains 22 as substring.

Together with 261059233, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_14250557 and since 261059231 and 14250557 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 261059194 and 261059203.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261059233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130529615 + 130529616.

It is an arithmetic number, because the mean of its divisors is an integer number (130529616).

Almost surely, 2^261059231 is an apocalyptic number.

261059231 is a deficient number, since it is larger than the sum of its proper divisors (1).

261059231 is an equidigital number, since it uses as much as digits as its factorization.

261059231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 261059231 is about 16157.3274708412. The cubic root of 261059231 is about 639.1159922436.

The spelling of 261059231 in words is "two hundred sixty-one million, fifty-nine thousand, two hundred thirty-one".