6991493 has 2 divisors, whose sum is σ = 6991494. Its totient is φ = 6991492.

The previous prime is 6991463. The next prime is 6991511. The reversal of 6991493 is 3941996.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3833764 + 3157729 = 1958^2 + 1777^2 .

It is a cyclic number.

It is not a de Polignac number, because 6991493 - 2¹² = 6987397 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 6991493.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6991463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3495746 + 3495747.

It is an arithmetic number, because the mean of its divisors is an integer number (3495747).

Almost surely, 2^6991493 is an apocalyptic number.

It is an amenable number.

6991493 is a deficient number, since it is larger than the sum of its proper divisors (1).

6991493 is an equidigital number, since it uses as much as digits as its factorization.

6991493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 52488, while the sum is 41.

The square root of 6991493 is about 2644.1431504365. The cubic root of 6991493 is about 191.2155949331.

It can be divided in two parts, 69914 and 93, that added together give a palindrome (70007).

The spelling of 6991493 in words is "six million, nine hundred ninety-one thousand, four hundred ninety-three".