261219449 has 4 divisors (see below), whose sum is σ = 261274980. Its totient is φ = 261163920.

The previous prime is 261219419. The next prime is 261219451. The reversal of 261219449 is 944912162.

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

It can be written as a sum of positive squares in 2 ways, for example, as 178409449 + 82810000 = 13357^2 + 9100^2 .

It is a cyclic number.

It is not a de Polignac number, because 261219449 - 2⁸ = 261219193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261219419) 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, 19982 + ... + 30359.

It is an arithmetic number, because the mean of its divisors is an integer number (65318745).

Almost surely, 2^261219449 is an apocalyptic number.

It is an amenable number.

261219449 is a deficient number, since it is larger than the sum of its proper divisors (55531).

261219449 is an equidigital number, since it uses as much as digits as its factorization.

261219449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55530.

The product of its digits is 31104, while the sum is 38.

The square root of 261219449 is about 16162.2847704154. The cubic root of 261219449 is about 639.2467121890.

The spelling of 261219449 in words is "two hundred sixty-one million, two hundred nineteen thousand, four hundred forty-nine".