It is a congruent number.
It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 651642.
2651642 is an apocalyptic number.
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
651642 is a wasteful number, since it uses less digits than its factorization.
651642 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 1693.
The square root of 651642 is about 807.2434577003. The cubic root of 651642 is about 86.6967909744.
Adding to 651642 its reverse (246156), we get a palindrome (897798).
The spelling of 651642 in words is "six hundred fifty-one thousand, six hundred forty-two".