645715201 has 2 divisors, whose sum is σ = 645715202. Its totient is φ = 645715200.

The previous prime is 645715181. The next prime is 645715207. The reversal of 645715201 is 102517546.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 501715201 + 144000000 = 22399^2 + 12000^2 .

It is a cyclic number.

It is not a de Polignac number, because 645715201 - 2¹¹ = 645713153 is a prime.

It is not a weakly prime, because it can be changed into another prime (645715207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322857600 + 322857601.

It is an arithmetic number, because the mean of its divisors is an integer number (322857601).

Almost surely, 2^645715201 is an apocalyptic number.

It is an amenable number.

645715201 is a deficient number, since it is larger than the sum of its proper divisors (1).

645715201 is an equidigital number, since it uses as much as digits as its factorization.

645715201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8400, while the sum is 31.

The square root of 645715201 is about 25410.9268032475. The cubic root of 645715201 is about 864.3314919021.

The spelling of 645715201 in words is "six hundred forty-five million, seven hundred fifteen thousand, two hundred one".