645295487 has 2 divisors, whose sum is σ = 645295488. Its totient is φ = 645295486.

The previous prime is 645295481. The next prime is 645295513. The reversal of 645295487 is 784592546.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-645295487 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (645295481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322647743 + 322647744.

It is an arithmetic number, because the mean of its divisors is an integer number (322647744).

Almost surely, 2^645295487 is an apocalyptic number.

645295487 is a deficient number, since it is larger than the sum of its proper divisors (1).

645295487 is an equidigital number, since it uses as much as digits as its factorization.

645295487 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2419200, while the sum is 50.

The square root of 645295487 is about 25402.6669269193. Note that the first 3 decimals coincide. The cubic root of 645295487 is about 864.1441798817.

The spelling of 645295487 in words is "six hundred forty-five million, two hundred ninety-five thousand, four hundred eighty-seven".