261448159 has 4 divisors (see below), whose sum is σ = 298797904. Its totient is φ = 224098416.

The previous prime is 261448133. The next prime is 261448177. The reversal of 261448159 is 951844162.

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 261448159 - 2¹³ = 261439967 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261448129) 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, 18674862 + ... + 18674875.

It is an arithmetic number, because the mean of its divisors is an integer number (74699476).

Almost surely, 2^261448159 is an apocalyptic number.

261448159 is a deficient number, since it is larger than the sum of its proper divisors (37349745).

261448159 is an equidigital number, since it uses as much as digits as its factorization.

261448159 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37349744.

The product of its digits is 69120, while the sum is 40.

The square root of 261448159 is about 16169.3586452896. The cubic root of 261448159 is about 639.4332213583.

The spelling of 261448159 in words is "two hundred sixty-one million, four hundred forty-eight thousand, one hundred fifty-nine".