261401 has 8 divisors (see below), whose sum is σ = 302400. Its totient is φ = 221328.

The previous prime is 261389. The next prime is 261407. The reversal of 261401 is 104162.

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 261401 - 2⁶ = 261337 is a prime.

It is a nialpdrome in base 8.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 261401.

It is not an unprimeable number, because it can be changed into a prime (261407) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 575 + ... + 923.

It is an arithmetic number, because the mean of its divisors is an integer number (37800).

2²⁶¹⁴⁰¹ is an apocalyptic number.

It is an amenable number.

261401 is a deficient number, since it is larger than the sum of its proper divisors (40999).

261401 is a wasteful number, since it uses less digits than its factorization.

261401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 463.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 261401 is about 511.2738991969. The cubic root of 261401 is about 63.9394772889.

Adding to 261401 its reverse (104162), we get a palindrome (365563).

The spelling of 261401 in words is "two hundred sixty-one thousand, four hundred one".