645422293 has 2 divisors, whose sum is σ = 645422294. Its totient is φ = 645422292.

The previous prime is 645422249. The next prime is 645422317. The reversal of 645422293 is 392224546.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 623351089 + 22071204 = 24967^2 + 4698^2 .

It is a cyclic number.

It is not a de Polignac number, because 645422293 - 2²⁹ = 108551381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (645422233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322711146 + 322711147.

It is an arithmetic number, because the mean of its divisors is an integer number (322711147).

Almost surely, 2^645422293 is an apocalyptic number.

It is an amenable number.

645422293 is a deficient number, since it is larger than the sum of its proper divisors (1).

645422293 is an equidigital number, since it uses as much as digits as its factorization.

645422293 is an evil number, because the sum of its binary digits is even.

The product of its digits is 103680, while the sum is 37.

The square root of 645422293 is about 25405.1627233521. The cubic root of 645422293 is about 864.2007800451.

The spelling of 645422293 in words is "six hundred forty-five million, four hundred twenty-two thousand, two hundred ninety-three".