651842 has 4 divisors (see below), whose sum is σ = 977766. Its totient is φ = 325920.

The previous prime is 651841. The next prime is 651853. The reversal of 651842 is 248156.

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

It can be written as a sum of positive squares in only one way, i.e., 450241 + 201601 = 671^2 + 449^2 .

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 651842.

It is not an unprimeable number, because it can be changed into a prime (651841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 162959 + ... + 162962.

2⁶⁵¹⁸⁴² is an apocalyptic number.

651842 is a deficient number, since it is larger than the sum of its proper divisors (325924).

651842 is a wasteful number, since it uses less digits than its factorization.

651842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325923.

The product of its digits is 1920, while the sum is 26.

The square root of 651842 is about 807.3673265621. The cubic root of 651842 is about 86.7056596398.

Adding to 651842 its reverse (248156), we get a palindrome (899998).

The spelling of 651842 in words is "six hundred fifty-one thousand, eight hundred forty-two".