645316131 has 8 divisors (see below), whose sum is σ = 872208400. Its totient is φ = 424317312.

The previous prime is 645316121. The next prime is 645316159. The reversal of 645316131 is 131613546.

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

It is not a de Polignac number, because 645316131 - 2¹⁵ = 645283363 is a prime.

It is a super-2 number, since 2×645316131² = 832865817857618322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (645316121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1473106 + ... + 1473543.

It is an arithmetic number, because the mean of its divisors is an integer number (109026050).

Almost surely, 2^645316131 is an apocalyptic number.

645316131 is a deficient number, since it is larger than the sum of its proper divisors (226892269).

645316131 is a wasteful number, since it uses less digits than its factorization.

645316131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2946725.

The product of its digits is 6480, while the sum is 30.

The square root of 645316131 is about 25403.0732589583. The cubic root of 645316131 is about 864.1533948861.

Adding to 645316131 its reverse (131613546), we get a palindrome (776929677).

The spelling of 645316131 in words is "six hundred forty-five million, three hundred sixteen thousand, one hundred thirty-one".