645113111 has 4 divisors (see below), whose sum is σ = 645558552. Its totient is φ = 644667672.

The previous prime is 645113107. The next prime is 645113113. The reversal of 645113111 is 111311546.

It is a happy number.

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 645113111 - 2² = 645113107 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645113113) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 220541 + ... + 223446.

It is an arithmetic number, because the mean of its divisors is an integer number (161389638).

Almost surely, 2^645113111 is an apocalyptic number.

645113111 is a deficient number, since it is larger than the sum of its proper divisors (445441).

645113111 is a wasteful number, since it uses less digits than its factorization.

645113111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 445440.

The product of its digits is 360, while the sum is 23.

The square root of 645113111 is about 25399.0769714177. The cubic root of 645113111 is about 864.0627629125.

Adding to 645113111 its reverse (111311546), we get a palindrome (756424657).

The spelling of 645113111 in words is "six hundred forty-five million, one hundred thirteen thousand, one hundred eleven".