7491691 has 2 divisors, whose sum is σ = 7491692. Its totient is φ = 7491690.

The previous prime is 7491689. The next prime is 7491697. The reversal of 7491691 is 1961947.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 7491691 - 2¹ = 7491689 is a prime.

It is a super-2 number, since 2×7491691² = 112250868078962, which contains 22 as substring.

Together with 7491689, it forms a pair of twin primes.

7491691 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 7491691.

It is not a weakly prime, because it can be changed into another prime (7491697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3745845 + 3745846.

It is an arithmetic number, because the mean of its divisors is an integer number (3745846).

Almost surely, 2^7491691 is an apocalyptic number.

7491691 is a deficient number, since it is larger than the sum of its proper divisors (1).

7491691 is an equidigital number, since it uses as much as digits as its factorization.

7491691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13608, while the sum is 37.

The square root of 7491691 is about 2737.0953582219. The cubic root of 7491691 is about 195.6710694916.

The spelling of 7491691 in words is "seven million, four hundred ninety-one thousand, six hundred ninety-one".