645141389 has 2 divisors, whose sum is σ = 645141390. Its totient is φ = 645141388.

The previous prime is 645141349. The next prime is 645141401. The reversal of 645141389 is 983141546.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 499746025 + 145395364 = 22355^2 + 12058^2 .

It is a cyclic number.

It is not a de Polignac number, because 645141389 - 2¹² = 645137293 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 (645141349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322570694 + 322570695.

It is an arithmetic number, because the mean of its divisors is an integer number (322570695).

Almost surely, 2^645141389 is an apocalyptic number.

It is an amenable number.

645141389 is a deficient number, since it is larger than the sum of its proper divisors (1).

645141389 is an equidigital number, since it uses as much as digits as its factorization.

645141389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 103680, while the sum is 41.

The square root of 645141389 is about 25399.6336390902. The cubic root of 645141389 is about 864.0753878870.

The spelling of 645141389 in words is "six hundred forty-five million, one hundred forty-one thousand, three hundred eighty-nine".