261439849 has 8 divisors (see below), whose sum is σ = 286857792. Its totient is φ = 236297040.

The previous prime is 261439819. The next prime is 261439861. The reversal of 261439849 is 948934162.

261439849 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 261439849 - 2²¹ = 259342697 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 261439799 and 261439808.

It is not an unprimeable number, because it can be changed into a prime (261439819) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66789 + ... + 70594.

It is an arithmetic number, because the mean of its divisors is an integer number (35857224).

Almost surely, 2^261439849 is an apocalyptic number.

It is an amenable number.

261439849 is a deficient number, since it is larger than the sum of its proper divisors (25417943).

261439849 is a wasteful number, since it uses less digits than its factorization.

261439849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137567.

The product of its digits is 373248, while the sum is 46.

The square root of 261439849 is about 16169.1016757271. The cubic root of 261439849 is about 639.4264465973.

The spelling of 261439849 in words is "two hundred sixty-one million, four hundred thirty-nine thousand, eight hundred forty-nine".