645115459 has 2 divisors, whose sum is σ = 645115460. Its totient is φ = 645115458.

The previous prime is 645115447. The next prime is 645115481. The reversal of 645115459 is 954511546.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 645115459 - 2¹⁷ = 644984387 is a prime.

It is not a weakly prime, because it can be changed into another prime (645113459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322557729 + 322557730.

It is an arithmetic number, because the mean of its divisors is an integer number (322557730).

Almost surely, 2^645115459 is an apocalyptic number.

645115459 is a deficient number, since it is larger than the sum of its proper divisors (1).

645115459 is an equidigital number, since it uses as much as digits as its factorization.

645115459 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108000, while the sum is 40.

The square root of 645115459 is about 25399.1231935278. The cubic root of 645115459 is about 864.0638112129.

The spelling of 645115459 in words is "six hundred forty-five million, one hundred fifteen thousand, four hundred fifty-nine".