261374613 has 4 divisors (see below), whose sum is σ = 348499488. Its totient is φ = 174249740.

The previous prime is 261374611. The next prime is 261374647. The reversal of 261374613 is 316473162.

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 261374613 - 2¹ = 261374611 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261374611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43562433 + ... + 43562438.

It is an arithmetic number, because the mean of its divisors is an integer number (87124872).

Almost surely, 2^261374613 is an apocalyptic number.

It is an amenable number.

261374613 is a deficient number, since it is larger than the sum of its proper divisors (87124875).

261374613 is an equidigital number, since it uses as much as digits as its factorization.

261374613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87124874.

The product of its digits is 18144, while the sum is 33.

The square root of 261374613 is about 16167.0842454662. The cubic root of 261374613 is about 639.3732576976.

The spelling of 261374613 in words is "two hundred sixty-one million, three hundred seventy-four thousand, six hundred thirteen".