261547411 has 2 divisors, whose sum is σ = 261547412. Its totient is φ = 261547410.

The previous prime is 261547379. The next prime is 261547417. The reversal of 261547411 is 114745162.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 261547411 - 2⁵ = 261547379 is a prime.

It is not a weakly prime, because it can be changed into another prime (261547417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130773705 + 130773706.

It is an arithmetic number, because the mean of its divisors is an integer number (130773706).

Almost surely, 2^261547411 is an apocalyptic number.

261547411 is a deficient number, since it is larger than the sum of its proper divisors (1).

261547411 is an equidigital number, since it uses as much as digits as its factorization.

261547411 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6720, while the sum is 31.

The square root of 261547411 is about 16172.4274924947. The cubic root of 261547411 is about 639.5141258571.

The spelling of 261547411 in words is "two hundred sixty-one million, five hundred forty-seven thousand, four hundred eleven".