646751171 has 12 divisors (see below), whose sum is σ = 733828032. Its totient is φ = 568986000.

The previous prime is 646751153. The next prime is 646751239. The reversal of 646751171 is 171157646.

It is not a de Polignac number, because 646751171 - 2¹⁸ = 646489027 is a prime.

It is not an unprimeable number, because it can be changed into a prime (646751101) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 82460 + ... + 89961.

It is an arithmetic number, because the mean of its divisors is an integer number (61152336).

Almost surely, 2^646751171 is an apocalyptic number.

646751171 is a deficient number, since it is larger than the sum of its proper divisors (87076861).

646751171 is a wasteful number, since it uses less digits than its factorization.

646751171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172474 (or 172463 counting only the distinct ones).

The product of its digits is 35280, while the sum is 38.

The square root of 646751171 is about 25431.3029748772. The cubic root of 646751171 is about 864.7934825012.

The spelling of 646751171 in words is "six hundred forty-six million, seven hundred fifty-one thousand, one hundred seventy-one".