6661431 has 24 divisors (see below), whose sum is σ = 11256960. Its totient is φ = 3716496.

The previous prime is 6661429. The next prime is 6661439. The reversal of 6661431 is 1341666.

6661431 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 6661431 - 2¹ = 6661429 is a prime.

It is a super-2 number, since 2×6661431² = 88749325935522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 6661395 and 6661404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6661439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1480 + ... + 3938.

It is an arithmetic number, because the mean of its divisors is an integer number (469040).

Almost surely, 2^6661431 is an apocalyptic number.

6661431 is a deficient number, since it is larger than the sum of its proper divisors (4595529).

6661431 is a wasteful number, since it uses less digits than its factorization.

6661431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2515 (or 2512 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 6661431 is about 2580.9748158399. The cubic root of 6661431 is about 188.1579233630.

The spelling of 6661431 in words is "six million, six hundred sixty-one thousand, four hundred thirty-one".