261437313 has 4 divisors (see below), whose sum is σ = 348583088. Its totient is φ = 174291540.

The previous prime is 261437311. The next prime is 261437317. The reversal of 261437313 is 313734162.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 261437313 - 2¹ = 261437311 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261437311) 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, 43572883 + ... + 43572888.

It is an arithmetic number, because the mean of its divisors is an integer number (87145772).

Almost surely, 2^261437313 is an apocalyptic number.

It is an amenable number.

261437313 is a deficient number, since it is larger than the sum of its proper divisors (87145775).

261437313 is an equidigital number, since it uses as much as digits as its factorization.

261437313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87145774.

The product of its digits is 9072, while the sum is 30.

The square root of 261437313 is about 16169.0232543589. The cubic root of 261437313 is about 639.4243790845.

The spelling of 261437313 in words is "two hundred sixty-one million, four hundred thirty-seven thousand, three hundred thirteen".