261346249 has 4 divisors (see below), whose sum is σ = 261393664. Its totient is φ = 261298836.

The previous prime is 261346237. The next prime is 261346277. The reversal of 261346249 is 942643162.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 261346249 - 2²¹ = 259249097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261346279) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14157 + ... + 26890.

It is an arithmetic number, because the mean of its divisors is an integer number (65348416).

Almost surely, 2^261346249 is an apocalyptic number.

It is an amenable number.

261346249 is a deficient number, since it is larger than the sum of its proper divisors (47415).

261346249 is an equidigital number, since it uses as much as digits as its factorization.

261346249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47414.

The product of its digits is 62208, while the sum is 37.

The square root of 261346249 is about 16166.2070072111. The cubic root of 261346249 is about 639.3501289031.

The spelling of 261346249 in words is "two hundred sixty-one million, three hundred forty-six thousand, two hundred forty-nine".