646693141 has 8 divisors (see below), whose sum is σ = 703240920. Its totient is φ = 592201728.

The previous prime is 646693133. The next prime is 646693171. The reversal of 646693141 is 141396646.

It can be written as a sum of positive squares in 4 ways, for example, as 148108900 + 498584241 = 12170^2 + 22329^2 .

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 646693141 - 2³ = 646693133 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 646693094 and 646693103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646693171) 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 7 ways as a sum of consecutive naturals, for example, 513436 + ... + 514693.

It is an arithmetic number, because the mean of its divisors is an integer number (87905115).

Almost surely, 2^646693141 is an apocalyptic number.

It is an amenable number.

646693141 is a deficient number, since it is larger than the sum of its proper divisors (56547779).

646693141 is a wasteful number, since it uses less digits than its factorization.

646693141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1028183.

The product of its digits is 93312, while the sum is 40.

The square root of 646693141 is about 25430.1620325156. The cubic root of 646693141 is about 864.7676170839.

The spelling of 646693141 in words is "six hundred forty-six million, six hundred ninety-three thousand, one hundred forty-one".