646311351 has 32 divisors (see below), whose sum is σ = 997982208. Its totient is φ = 364428000.

The previous prime is 646311299. The next prime is 646311359. The reversal of 646311351 is 153113646.

It is not a de Polignac number, because 646311351 - 2¹⁷ = 646180279 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646311359) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 860226 + ... + 860976.

It is an arithmetic number, because the mean of its divisors is an integer number (31186944).

Almost surely, 2^646311351 is an apocalyptic number.

646311351 is a deficient number, since it is larger than the sum of its proper divisors (351670857).

646311351 is a wasteful number, since it uses less digits than its factorization.

646311351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1251.

The product of its digits is 6480, while the sum is 30.

The square root of 646311351 is about 25422.6542870724. The cubic root of 646311351 is about 864.5974051749.

Adding to 646311351 its reverse (153113646), we get a palindrome (799424997).

The spelling of 646311351 in words is "six hundred forty-six million, three hundred eleven thousand, three hundred fifty-one".