6690451 has 16 divisors (see below), whose sum is σ = 7490560. Its totient is φ = 5948640.

The previous prime is 6690433. The next prime is 6690473. The reversal of 6690451 is 1540966.

It is a cyclic number.

It is not a de Polignac number, because 6690451 - 2⁷ = 6690323 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is not an unprimeable number, because it can be changed into a prime (6690251) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 21640 + ... + 21946.

It is an arithmetic number, because the mean of its divisors is an integer number (468160).

Almost surely, 2^6690451 is an apocalyptic number.

6690451 is a deficient number, since it is larger than the sum of its proper divisors (800109).

6690451 is a wasteful number, since it uses less digits than its factorization.

6690451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 394.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 6690451 is about 2586.5906131431. The cubic root of 6690451 is about 188.4307592789.

The spelling of 6690451 in words is "six million, six hundred ninety thousand, four hundred fifty-one".