646211131 has 8 divisors (see below), whose sum is σ = 660317760. Its totient is φ = 632119488.

The previous prime is 646211119. The next prime is 646211141. The reversal of 646211131 is 131112646.

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 646211131 - 2¹⁵ = 646178363 is a prime.

It is a super-2 number, since 2×646211131² = 835177651656598322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 646211096 and 646211105.

It is not an unprimeable number, because it can be changed into a prime (646211141) 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, 157255 + ... + 161311.

It is an arithmetic number, because the mean of its divisors is an integer number (82539720).

Almost surely, 2^646211131 is an apocalyptic number.

646211131 is a deficient number, since it is larger than the sum of its proper divisors (14106629).

646211131 is a wasteful number, since it uses less digits than its factorization.

646211131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7493.

The product of its digits is 864, while the sum is 25.

The square root of 646211131 is about 25420.6831340151. The cubic root of 646211131 is about 864.5527133861.

Adding to 646211131 its reverse (131112646), we get a palindrome (777323777).

The spelling of 646211131 in words is "six hundred forty-six million, two hundred eleven thousand, one hundred thirty-one".