6861631 has 8 divisors (see below), whose sum is σ = 7862400. Its totient is φ = 5866008.

The previous prime is 6861629. The next prime is 6861691. The reversal of 6861631 is 1361686.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6861631 - 2¹ = 6861629 is a prime.

It is a super-2 number, since 2×6861631² = 94163959960322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 6861593 and 6861602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6861601) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2220 + ... + 4318.

It is an arithmetic number, because the mean of its divisors is an integer number (982800).

Almost surely, 2^6861631 is an apocalyptic number.

6861631 is a deficient number, since it is larger than the sum of its proper divisors (1000769).

6861631 is a wasteful number, since it uses less digits than its factorization.

6861631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2573.

The product of its digits is 5184, while the sum is 31.

The square root of 6861631 is about 2619.4715115840. The cubic root of 6861631 is about 190.0242905233.

Subtracting from 6861631 its reverse (1361686), we obtain a palindrome (5499945).

The spelling of 6861631 in words is "six million, eight hundred sixty-one thousand, six hundred thirty-one".