645325741 has 2 divisors, whose sum is σ = 645325742. Its totient is φ = 645325740.

The previous prime is 645325693. The next prime is 645325787. The reversal of 645325741 is 147523546.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 644093641 + 1232100 = 25379^2 + 1110^2 .

It is a cyclic number.

It is not a de Polignac number, because 645325741 - 2⁷ = 645325613 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 645325741.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (645325141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322662870 + 322662871.

It is an arithmetic number, because the mean of its divisors is an integer number (322662871).

Almost surely, 2^645325741 is an apocalyptic number.

It is an amenable number.

645325741 is a deficient number, since it is larger than the sum of its proper divisors (1).

645325741 is an equidigital number, since it uses as much as digits as its factorization.

645325741 is an evil number, because the sum of its binary digits is even.

The product of its digits is 100800, while the sum is 37.

The square root of 645325741 is about 25403.2624085963. The cubic root of 645325741 is about 864.1576845009.

The spelling of 645325741 in words is "six hundred forty-five million, three hundred twenty-five thousand, seven hundred forty-one".