645007471 has 2 divisors, whose sum is σ = 645007472. Its totient is φ = 645007470.

The previous prime is 645007457. The next prime is 645007477. The reversal of 645007471 is 174700546.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 645007471 - 2²¹ = 642910319 is a prime.

It is a super-3 number, since 3×645007471³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (645007477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322503735 + 322503736.

It is an arithmetic number, because the mean of its divisors is an integer number (322503736).

Almost surely, 2^645007471 is an apocalyptic number.

645007471 is a deficient number, since it is larger than the sum of its proper divisors (1).

645007471 is an equidigital number, since it uses as much as digits as its factorization.

645007471 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23520, while the sum is 34.

The square root of 645007471 is about 25396.9972831435. The cubic root of 645007471 is about 864.0155956940.

The spelling of 645007471 in words is "six hundred forty-five million, seven thousand, four hundred seventy-one".