261774847 has 2 divisors, whose sum is σ = 261774848. Its totient is φ = 261774846.

The previous prime is 261774817. The next prime is 261774871. The reversal of 261774847 is 748477162.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 261774847 - 2²⁷ = 127557119 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 261774797 and 261774806.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261774817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130887423 + 130887424.

It is an arithmetic number, because the mean of its divisors is an integer number (130887424).

Almost surely, 2^261774847 is an apocalyptic number.

261774847 is a deficient number, since it is larger than the sum of its proper divisors (1).

261774847 is an equidigital number, since it uses as much as digits as its factorization.

261774847 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 526848, while the sum is 46.

The square root of 261774847 is about 16179.4575619827. The cubic root of 261774847 is about 639.6994413924.

The spelling of 261774847 in words is "two hundred sixty-one million, seven hundred seventy-four thousand, eight hundred forty-seven".