645849115 has 4 divisors (see below), whose sum is σ = 775018944. Its totient is φ = 516679288.

The previous prime is 645849109. The next prime is 645849181. The reversal of 645849115 is 511948546.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 645849115 - 2⁹ = 645848603 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64584907 + ... + 64584916.

It is an arithmetic number, because the mean of its divisors is an integer number (193754736).

Almost surely, 2^645849115 is an apocalyptic number.

645849115 is a deficient number, since it is larger than the sum of its proper divisors (129169829).

645849115 is a wasteful number, since it uses less digits than its factorization.

645849115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129169828.

The product of its digits is 172800, while the sum is 43.

The square root of 645849115 is about 25413.5616354733. The cubic root of 645849115 is about 864.3912386174.

The spelling of 645849115 in words is "six hundred forty-five million, eight hundred forty-nine thousand, one hundred fifteen".