6899969 has 2 divisors, whose sum is σ = 6899970. Its totient is φ = 6899968.

The previous prime is 6899951. The next prime is 6899989. The reversal of 6899969 is 9699986.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4906225 + 1993744 = 2215^2 + 1412^2 .

It is a cyclic number.

It is not a de Polignac number, because 6899969 - 2¹² = 6895873 is a prime.

It is a super-2 number, since 2×6899969² = 95219144401922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (6899989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3449984 + 3449985.

It is an arithmetic number, because the mean of its divisors is an integer number (3449985).

Almost surely, 2^6899969 is an apocalyptic number.

It is an amenable number.

6899969 is a deficient number, since it is larger than the sum of its proper divisors (1).

6899969 is an equidigital number, since it uses as much as digits as its factorization.

6899969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1889568, while the sum is 56.

The square root of 6899969 is about 2626.7792065570. The cubic root of 6899969 is about 190.3775410890.

The spelling of 6899969 in words is "six million, eight hundred ninety-nine thousand, nine hundred sixty-nine".