6690531 has 4 divisors (see below), whose sum is σ = 8920712. Its totient is φ = 4460352.

The previous prime is 6690517. The next prime is 6690557. The reversal of 6690531 is 1350966.

It is a happy number.

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

It is not a de Polignac number, because 6690531 - 2²² = 2496227 is a prime.

It is a super-3 number, since 3×6690531³ (a number of 21 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6690331) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1115086 + ... + 1115091.

It is an arithmetic number, because the mean of its divisors is an integer number (2230178).

Almost surely, 2^6690531 is an apocalyptic number.

6690531 is a deficient number, since it is larger than the sum of its proper divisors (2230181).

6690531 is a wasteful number, since it uses less digits than its factorization.

6690531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2230180.

The product of its (nonzero) digits is 4860, while the sum is 30.

The square root of 6690531 is about 2586.6060774691. The cubic root of 6690531 is about 188.4315103195.

The spelling of 6690531 in words is "six million, six hundred ninety thousand, five hundred thirty-one".