261225847 has 2 divisors, whose sum is σ = 261225848. Its totient is φ = 261225846.

The previous prime is 261225821. The next prime is 261225929. The reversal of 261225847 is 748522162.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261225847 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261225047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130612923 + 130612924.

It is an arithmetic number, because the mean of its divisors is an integer number (130612924).

Almost surely, 2^261225847 is an apocalyptic number.

261225847 is a deficient number, since it is larger than the sum of its proper divisors (1).

261225847 is an equidigital number, since it uses as much as digits as its factorization.

261225847 is an evil number, because the sum of its binary digits is even.

The product of its digits is 53760, while the sum is 37.

The square root of 261225847 is about 16162.4826991400. The cubic root of 261225847 is about 639.2519311305.

The spelling of 261225847 in words is "two hundred sixty-one million, two hundred twenty-five thousand, eight hundred forty-seven".