261493 has 8 divisors (see below), whose sum is σ = 276480. Its totient is φ = 246960.

The previous prime is 261467. The next prime is 261509. The reversal of 261493 is 394162.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261493 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 (261433) 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, 1996 + ... + 2122.

It is an arithmetic number, because the mean of its divisors is an integer number (34560).

2²⁶¹⁴⁹³ is an apocalyptic number.

It is an amenable number.

261493 is a deficient number, since it is larger than the sum of its proper divisors (14987).

261493 is a wasteful number, since it uses less digits than its factorization.

261493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227.

The product of its digits is 1296, while the sum is 25.

The square root of 261493 is about 511.3638626262. The cubic root of 261493 is about 63.9469775687.

The spelling of 261493 in words is "two hundred sixty-one thousand, four hundred ninety-three".