645097 has 2 divisors, whose sum is σ = 645098. Its totient is φ = 645096.

The previous prime is 645091. The next prime is 645131. The reversal of 645097 is 790546.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 467856 + 177241 = 684^2 + 421^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-645097 is a prime.

It is not a weakly prime, because it can be changed into another prime (645091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322548 + 322549.

It is an arithmetic number, because the mean of its divisors is an integer number (322549).

2⁶⁴⁵⁰⁹⁷ is an apocalyptic number.

It is an amenable number.

645097 is a deficient number, since it is larger than the sum of its proper divisors (1).

645097 is an equidigital number, since it uses as much as digits as its factorization.

645097 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 645097 is about 803.1793075024. The cubic root of 645097 is about 86.4055569843.

It can be divided in two parts, 64509 and 7, that added together give a square (64516 = 254²).

The spelling of 645097 in words is "six hundred forty-five thousand, ninety-seven".