645829513 has 16 divisors (see below), whose sum is σ = 795013120. Its totient is φ = 512232336.

The previous prime is 645829501. The next prime is 645829519. The reversal of 645829513 is 315928546.

It is not a de Polignac number, because 645829513 - 2⁹ = 645829001 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 645829513.

It is not an unprimeable number, because it can be changed into a prime (645829519) 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, 50745 + ... + 62182.

It is an arithmetic number, because the mean of its divisors is an integer number (49688320).

Almost surely, 2^645829513 is an apocalyptic number.

It is an amenable number.

645829513 is a deficient number, since it is larger than the sum of its proper divisors (149183607).

645829513 is a wasteful number, since it uses less digits than its factorization.

645829513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112996.

The product of its digits is 259200, while the sum is 43.

The square root of 645829513 is about 25413.1759723180. The cubic root of 645829513 is about 864.3824935570.

The spelling of 645829513 in words is "six hundred forty-five million, eight hundred twenty-nine thousand, five hundred thirteen".