646111031 has 4 divisors (see below), whose sum is σ = 650390064. Its totient is φ = 641832000.

The previous prime is 646111019. The next prime is 646111051. The reversal of 646111031 is 130111646.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-646111031 is a prime.

It is a super-2 number, since 2×646111031² = 834918928759765922, 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 = 646110988 and 646111006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646111051) 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 3 ways as a sum of consecutive naturals, for example, 2139290 + ... + 2139591.

It is an arithmetic number, because the mean of its divisors is an integer number (162597516).

Almost surely, 2^646111031 is an apocalyptic number.

646111031 is a deficient number, since it is larger than the sum of its proper divisors (4279033).

646111031 is a wasteful number, since it uses less digits than its factorization.

646111031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4279032.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 646111031 is about 25418.7141885659. The cubic root of 646111031 is about 864.5080704970.

Adding to 646111031 its reverse (130111646), we get a palindrome (776222677).

The spelling of 646111031 in words is "six hundred forty-six million, one hundred eleven thousand, thirty-one".