644114530131 has 16 divisors (see below), whose sum is σ = 879793464480. Its totient is φ = 418923290880.

The previous prime is 644114530123. The next prime is 644114530141. The reversal of 644114530131 is 131035411446.

It is not a de Polignac number, because 644114530131 - 2³ = 644114530123 is a prime.

It is a super-2 number, since 2×644114530131² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 644114530092 and 644114530101.

It is not an unprimeable number, because it can be changed into a prime (644114530141) 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, 5400861 + ... + 5518833.

It is an arithmetic number, because the mean of its divisors is an integer number (54987091530).

Almost surely, 2^644114530131 is an apocalyptic number.

644114530131 is a deficient number, since it is larger than the sum of its proper divisors (235678934349).

644114530131 is a wasteful number, since it uses less digits than its factorization.

644114530131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162406.

The product of its (nonzero) digits is 17280, while the sum is 33.

Adding to 644114530131 its reverse (131035411446), we get a palindrome (775149941577).

The spelling of 644114530131 in words is "six hundred forty-four billion, one hundred fourteen million, five hundred thirty thousand, one hundred thirty-one".