645502971 has 16 divisors (see below), whose sum is σ = 932494464. Its totient is φ = 395601024.

The previous prime is 645502969. The next prime is 645502973. The reversal of 645502971 is 179205546.

It is an interprime number because it is at equal distance from previous prime (645502969) and next prime (645502973).

It is not a de Polignac number, because 645502971 - 2¹ = 645502969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (645502973) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 144981 + ... + 149366.

It is an arithmetic number, because the mean of its divisors is an integer number (58280904).

Almost surely, 2^645502971 is an apocalyptic number.

645502971 is a deficient number, since it is larger than the sum of its proper divisors (286991493).

645502971 is a wasteful number, since it uses less digits than its factorization.

645502971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 294410.

The product of its (nonzero) digits is 75600, while the sum is 39.

The square root of 645502971 is about 25406.7505006051. The cubic root of 645502971 is about 864.2367870059.

The spelling of 645502971 in words is "six hundred forty-five million, five hundred two thousand, nine hundred seventy-one".