645341331 has 8 divisors (see below), whose sum is σ = 863884224. Its totient is φ = 428513000.

The previous prime is 645341329. The next prime is 645341341. The reversal of 645341331 is 133143546.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 645341331 - 2¹ = 645341329 is a prime.

It is a super-2 number, since 2×645341331² = 832930866993703122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (645341311) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 427761 + ... + 429266.

It is an arithmetic number, because the mean of its divisors is an integer number (107985528).

Almost surely, 2^645341331 is an apocalyptic number.

645341331 is a deficient number, since it is larger than the sum of its proper divisors (218542893).

645341331 is a wasteful number, since it uses less digits than its factorization.

645341331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 857281.

The product of its digits is 12960, while the sum is 30.

The square root of 645341331 is about 25403.5692570946. The cubic root of 645341331 is about 864.1646433172.

Adding to 645341331 its reverse (133143546), we get a palindrome (778484877).

The spelling of 645341331 in words is "six hundred forty-five million, three hundred forty-one thousand, three hundred thirty-one".