646031901 has 16 divisors (see below), whose sum is σ = 918195200. Its totient is φ = 402852528.

The previous prime is 646031899. The next prime is 646031917. The reversal of 646031901 is 109130646.

It is not a de Polignac number, because 646031901 - 2¹ = 646031899 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646031941) 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, 67231 + ... + 76236.

It is an arithmetic number, because the mean of its divisors is an integer number (57387200).

Almost surely, 2^646031901 is an apocalyptic number.

It is an amenable number.

646031901 is a deficient number, since it is larger than the sum of its proper divisors (272163299).

646031901 is a wasteful number, since it uses less digits than its factorization.

646031901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143568.

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 646031901 is about 25417.1576105591. The cubic root of 646031901 is about 864.4727766063.

The spelling of 646031901 in words is "six hundred forty-six million, thirty-one thousand, nine hundred one".