645411601 has 2 divisors, whose sum is σ = 645411602. Its totient is φ = 645411600.

The previous prime is 645411583. The next prime is 645411623. The reversal of 645411601 is 106114546.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 381186576 + 264225025 = 19524^2 + 16255^2 .

It is a cyclic number.

It is not a de Polignac number, because 645411601 - 2²³ = 637022993 is a prime.

It is a super-2 number, since 2×645411601² = 833112269410766402, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 645411601.

It is not a weakly prime, because it can be changed into another prime (645411691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322705800 + 322705801.

It is an arithmetic number, because the mean of its divisors is an integer number (322705801).

Almost surely, 2^645411601 is an apocalyptic number.

It is an amenable number.

645411601 is a deficient number, since it is larger than the sum of its proper divisors (1).

645411601 is an equidigital number, since it uses as much as digits as its factorization.

645411601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 645411601 is about 25404.9522928109. The cubic root of 645411601 is about 864.1960079313.

The spelling of 645411601 in words is "six hundred forty-five million, four hundred eleven thousand, six hundred one".