645197 has 8 divisors (see below), whose sum is σ = 749952. Its totient is φ = 543600.

The previous prime is 645187. The next prime is 645233. The reversal of 645197 is 791546.

It is a happy number.

645197 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 645197 - 2¹⁰ = 644173 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645137) 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, 329 + ... + 1182.

It is an arithmetic number, because the mean of its divisors is an integer number (93744).

2⁶⁴⁵¹⁹⁷ is an apocalyptic number.

It is an amenable number.

645197 is a deficient number, since it is larger than the sum of its proper divisors (104755).

645197 is a wasteful number, since it uses less digits than its factorization.

645197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1579.

The product of its digits is 7560, while the sum is 32.

The square root of 645197 is about 803.2415576898. The cubic root of 645197 is about 86.4100214856.

The spelling of 645197 in words is "six hundred forty-five thousand, one hundred ninety-seven".