6909631 has 4 divisors (see below), whose sum is σ = 6927264. Its totient is φ = 6892000.

The previous prime is 6909629. The next prime is 6909641. The reversal of 6909631 is 1369096.

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

It is a cyclic number.

It is not a de Polignac number, because 6909631 - 2¹ = 6909629 is a prime.

It is a super-2 number, since 2×6909631² = 95486001112322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6909641) 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, 8215 + ... + 9016.

It is an arithmetic number, because the mean of its divisors is an integer number (1731816).

Almost surely, 2^6909631 is an apocalyptic number.

6909631 is a deficient number, since it is larger than the sum of its proper divisors (17633).

6909631 is a wasteful number, since it uses less digits than its factorization.

6909631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17632.

The product of its (nonzero) digits is 8748, while the sum is 34.

The square root of 6909631 is about 2628.6176975741. The cubic root of 6909631 is about 190.4663612894.

The spelling of 6909631 in words is "six million, nine hundred nine thousand, six hundred thirty-one".