651042 has 24 divisors (see below), whose sum is σ = 1612416. Its totient is φ = 185976.

The previous prime is 651029. The next prime is 651043. The reversal of 651042 is 240156.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (651043) by changing a digit.

651042 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2458 + ... + 2709.

It is an arithmetic number, because the mean of its divisors is an integer number (67184).

2⁶⁵¹⁰⁴² is an apocalyptic number.

651042 is an abundant number, since it is smaller than the sum of its proper divisors (961374).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

651042 is a wasteful number, since it uses less digits than its factorization.

651042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5182 (or 5179 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 651042 is about 806.8717370190. The cubic root of 651042 is about 86.6701740855.

Adding to 651042 its reverse (240156), we get a palindrome (891198).

The spelling of 651042 in words is "six hundred fifty-one thousand, forty-two".