261798847 has 4 divisors (see below), whose sum is σ = 261983736. Its totient is φ = 261613960.

The previous prime is 261798839. The next prime is 261798881. The reversal of 261798847 is 748897162.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 261798847 - 2³ = 261798839 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 261798794 and 261798803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261738847) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90304 + ... + 93157.

It is an arithmetic number, because the mean of its divisors is an integer number (65495934).

Almost surely, 2^261798847 is an apocalyptic number.

261798847 is a deficient number, since it is larger than the sum of its proper divisors (184889).

261798847 is a wasteful number, since it uses less digits than its factorization.

261798847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184888.

The product of its digits is 1354752, while the sum is 52.

The square root of 261798847 is about 16180.1992262147. The cubic root of 261798847 is about 639.7189904026.

The spelling of 261798847 in words is "two hundred sixty-one million, seven hundred ninety-eight thousand, eight hundred forty-seven".