645509083 has 2 divisors, whose sum is σ = 645509084. Its totient is φ = 645509082.

The previous prime is 645509071. The next prime is 645509087. The reversal of 645509083 is 380905546.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 645509083 - 2²¹ = 643411931 is a prime.

It is not a weakly prime, because it can be changed into another prime (645509087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322754541 + 322754542.

It is an arithmetic number, because the mean of its divisors is an integer number (322754542).

Almost surely, 2^645509083 is an apocalyptic number.

645509083 is a deficient number, since it is larger than the sum of its proper divisors (1).

645509083 is an equidigital number, since it uses as much as digits as its factorization.

645509083 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 129600, while the sum is 40.

The square root of 645509083 is about 25406.8707833137. The cubic root of 645509083 is about 864.2395146972.

The spelling of 645509083 in words is "six hundred forty-five million, five hundred nine thousand, eighty-three".