649451 has 16 divisors (see below), whose sum is σ = 787968. Its totient is φ = 528000.

The previous prime is 649427. The next prime is 649457. The reversal of 649451 is 154946.

It is not a de Polignac number, because 649451 - 2¹⁴ = 633067 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 649451.

It is not an unprimeable number, because it can be changed into a prime (649457) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4226 + ... + 4376.

It is an arithmetic number, because the mean of its divisors is an integer number (49248).

2⁶⁴⁹⁴⁵¹ is an apocalyptic number.

649451 is a deficient number, since it is larger than the sum of its proper divisors (138517).

649451 is a wasteful number, since it uses less digits than its factorization.

649451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202.

The product of its digits is 4320, while the sum is 29.

The square root of 649451 is about 805.8852275604. The cubic root of 649451 is about 86.5995157022.

It can be divided in two parts, 64945 and 1, that added together give a palindrome (64946).

The spelling of 649451 in words is "six hundred forty-nine thousand, four hundred fifty-one".