646974111 has 16 divisors (see below), whose sum is σ = 1037753600. Its totient is φ = 350241408.

The previous prime is 646974101. The next prime is 646974157. The reversal of 646974111 is 111479646.

It is not a de Polignac number, because 646974111 - 2¹⁹ = 646449823 is a prime.

It is a super-3 number, since 3×646974111³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 646974111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646974101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 810346 + ... + 811143.

It is an arithmetic number, because the mean of its divisors is an integer number (64859600).

Almost surely, 2^646974111 is an apocalyptic number.

646974111 is a deficient number, since it is larger than the sum of its proper divisors (390779489).

646974111 is a wasteful number, since it uses less digits than its factorization.

646974111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1621518.

The product of its digits is 36288, while the sum is 39.

The square root of 646974111 is about 25435.6857780560. The cubic root of 646974111 is about 864.8928380282.

The spelling of 646974111 in words is "six hundred forty-six million, nine hundred seventy-four thousand, one hundred eleven".