646001131 has 4 divisors (see below), whose sum is σ = 647102232. Its totient is φ = 644900032.

The previous prime is 646001119. The next prime is 646001137. The reversal of 646001131 is 131100646.

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 646001131 - 2¹³ = 645992939 is a prime.

It is a super-2 number, since 2×646001131² = 834634922506558322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (646001137) 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, 549670 + ... + 550843.

It is an arithmetic number, because the mean of its divisors is an integer number (161775558).

Almost surely, 2^646001131 is an apocalyptic number.

646001131 is a deficient number, since it is larger than the sum of its proper divisors (1101101).

646001131 is a wasteful number, since it uses less digits than its factorization.

646001131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1101100.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 646001131 is about 25416.5523035678. The cubic root of 646001131 is about 864.4590516650.

Adding to 646001131 its reverse (131100646), we get a palindrome (777101777).

The spelling of 646001131 in words is "six hundred forty-six million, one thousand, one hundred thirty-one".