261363447 has 6 divisors (see below), whose sum is σ = 377524992. Its totient is φ = 174242292.

The previous prime is 261363419. The next prime is 261363461. The reversal of 261363447 is 744363162.

It is a happy number.

261363447 is a `hidden beast` number, since 2 + 6 + 13 + 634 + 4 + 7 = 666.

It is not a de Polignac number, because 261363447 - 2¹⁴ = 261347063 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261363547) 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 in 5 ways as a sum of consecutive naturals, for example, 14520183 + ... + 14520200.

It is an arithmetic number, because the mean of its divisors is an integer number (62920832).

Almost surely, 2^261363447 is an apocalyptic number.

261363447 is a deficient number, since it is larger than the sum of its proper divisors (116161545).

261363447 is a wasteful number, since it uses less digits than its factorization.

261363447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29040389 (or 29040386 counting only the distinct ones).

The product of its digits is 72576, while the sum is 36.

The square root of 261363447 is about 16166.7389104915. The cubic root of 261363447 is about 639.3641528304.

The spelling of 261363447 in words is "two hundred sixty-one million, three hundred sixty-three thousand, four hundred forty-seven".