261901 has 8 divisors (see below), whose sum is σ = 279360. Its totient is φ = 244992.

The previous prime is 261887. The next prime is 261917. The reversal of 261901 is 109162.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 261901 - 2⁷ = 261773 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261971) 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 7 ways as a sum of consecutive naturals, for example, 1261 + ... + 1453.

It is an arithmetic number, because the mean of its divisors is an integer number (34920).

2²⁶¹⁹⁰¹ is an apocalyptic number.

It is an amenable number.

261901 is a deficient number, since it is larger than the sum of its proper divisors (17459).

261901 is a wasteful number, since it uses less digits than its factorization.

261901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275.

The product of its (nonzero) digits is 108, while the sum is 19.

The square root of 261901 is about 511.7626402933. The cubic root of 261901 is about 63.9802184958.

The spelling of 261901 in words is "two hundred sixty-one thousand, nine hundred one".