261814601 has 4 divisors (see below), whose sum is σ = 261888900. Its totient is φ = 261740304.

The previous prime is 261814591. The next prime is 261814607. The reversal of 261814601 is 106418162.

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 67240000 + 194574601 = 8200^2 + 13949^2 .

It is a cyclic number.

It is not a de Polignac number, because 261814601 - 2⁶ = 261814537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261814607) 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, 31586 + ... + 39003.

It is an arithmetic number, because the mean of its divisors is an integer number (65472225).

Almost surely, 2^261814601 is an apocalyptic number.

It is an amenable number.

261814601 is a deficient number, since it is larger than the sum of its proper divisors (74299).

261814601 is an equidigital number, since it uses as much as digits as its factorization.

261814601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74298.

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 261814601 is about 16180.6860484962. The cubic root of 261814601 is about 639.7318220492.

The spelling of 261814601 in words is "two hundred sixty-one million, eight hundred fourteen thousand, six hundred one".