6991429 has 4 divisors (see below), whose sum is σ = 7087276. Its totient is φ = 6895584.

The previous prime is 6991427. The next prime is 6991447. The reversal of 6991429 is 9241996.

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

It can be written as a sum of positive squares in 2 ways, for example, as 3247204 + 3744225 = 1802^2 + 1935^2 .

It is a cyclic number.

It is not a de Polignac number, because 6991429 - 2¹ = 6991427 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6991391 and 6991400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6991427) 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, 47814 + ... + 47959.

It is an arithmetic number, because the mean of its divisors is an integer number (1771819).

Almost surely, 2^6991429 is an apocalyptic number.

It is an amenable number.

6991429 is a deficient number, since it is larger than the sum of its proper divisors (95847).

6991429 is an equidigital number, since it uses as much as digits as its factorization.

6991429 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95846.

The product of its digits is 34992, while the sum is 40.

The square root of 6991429 is about 2644.1310481896. The cubic root of 6991429 is about 191.2150114700.

The spelling of 6991429 in words is "six million, nine hundred ninety-one thousand, four hundred twenty-nine".