661497 has 8 divisors (see below), whose sum is σ = 886080. Its totient is φ = 438960.

The previous prime is 661483. The next prime is 661513. The reversal of 661497 is 794166.

It is a happy number.

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

It is not a de Polignac number, because 661497 - 2⁴ = 661481 is a prime.

It is not an unprimeable number, because it can be changed into a prime (661417) 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, 579 + ... + 1287.

It is an arithmetic number, because the mean of its divisors is an integer number (110760).

2⁶⁶¹⁴⁹⁷ is an apocalyptic number.

It is an amenable number.

661497 is a deficient number, since it is larger than the sum of its proper divisors (224583).

661497 is a wasteful number, since it uses less digits than its factorization.

661497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1023.

The product of its digits is 9072, while the sum is 33.

The square root of 661497 is about 813.3246584237. The cubic root of 661497 is about 87.1316542848.

The spelling of 661497 in words is "six hundred sixty-one thousand, four hundred ninety-seven".