261304319 has 4 divisors (see below), whose sum is σ = 261544920. Its totient is φ = 261063720.

The previous prime is 261304279. The next prime is 261304339. The reversal of 261304319 is 913403162.

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 261304319 - 2⁸ = 261304063 is a prime.

It is a super-2 number, since 2×261304319² = 136559894256107522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 261304291 and 261304300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261304339) 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, 118664 + ... + 120845.

It is an arithmetic number, because the mean of its divisors is an integer number (65386230).

Almost surely, 2^261304319 is an apocalyptic number.

261304319 is a deficient number, since it is larger than the sum of its proper divisors (240601).

261304319 is a wasteful number, since it uses less digits than its factorization.

261304319 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240600.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 261304319 is about 16164.9101141949. The cubic root of 261304319 is about 639.3159349493.

The spelling of 261304319 in words is "two hundred sixty-one million, three hundred four thousand, three hundred nineteen".