645037 has 2 divisors, whose sum is σ = 645038. Its totient is φ = 645036.

The previous prime is 645023. The next prime is 645041. The reversal of 645037 is 730546.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 346921 + 298116 = 589^2 + 546^2 .

It is a cyclic number.

It is not a de Polignac number, because 645037 - 2⁷ = 644909 is a prime.

645037 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (645067) 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, 322518 + 322519.

It is an arithmetic number, because the mean of its divisors is an integer number (322519).

2⁶⁴⁵⁰³⁷ is an apocalyptic number.

It is an amenable number.

645037 is a deficient number, since it is larger than the sum of its proper divisors (1).

645037 is an equidigital number, since it uses as much as digits as its factorization.

645037 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2520, while the sum is 25.

The square root of 645037 is about 803.1419550739. The cubic root of 645037 is about 86.4028780620.

The spelling of 645037 in words is "six hundred forty-five thousand, thirty-seven".