646151 has 4 divisors (see below), whose sum is σ = 704904. Its totient is φ = 587400.

The previous prime is 646147. The next prime is 646157. The reversal of 646151 is 151646.

646151 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 646151 - 2² = 646147 is a prime.

It is a super-2 number, since 2×646151² = 835022229602, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646157) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29360 + ... + 29381.

It is an arithmetic number, because the mean of its divisors is an integer number (176226).

2⁶⁴⁶¹⁵¹ is an apocalyptic number.

646151 is a deficient number, since it is larger than the sum of its proper divisors (58753).

646151 is a wasteful number, since it uses less digits than its factorization.

646151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58752.

The product of its digits is 720, while the sum is 23.

The square root of 646151 is about 803.8351821114. The cubic root of 646151 is about 86.4525896541.

Adding to 646151 its reverse (151646), we get a palindrome (797797).

It can be divided in two parts, 646 and 151, that added together give a palindrome (797).

The spelling of 646151 in words is "six hundred forty-six thousand, one hundred fifty-one".