661493 has 8 divisors (see below), whose sum is σ = 770688. Its totient is φ = 555984.

The previous prime is 661483. The next prime is 661513. The reversal of 661493 is 394166.

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 661493 - 2⁴ = 661477 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 (661483) 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, 521 + ... + 1262.

It is an arithmetic number, because the mean of its divisors is an integer number (96336).

2⁶⁶¹⁴⁹³ is an apocalyptic number.

It is an amenable number.

661493 is a deficient number, since it is larger than the sum of its proper divisors (109195).

661493 is a wasteful number, since it uses less digits than its factorization.

661493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1843.

The product of its digits is 3888, while the sum is 29.

The square root of 661493 is about 813.3221993773. The cubic root of 661493 is about 87.1314786592.

The spelling of 661493 in words is "six hundred sixty-one thousand, four hundred ninety-three".