2947997491 has 2 divisors, whose sum is σ = 2947997492. Its totient is φ = 2947997490.

The previous prime is 2947997473. The next prime is 2947997501. The reversal of 2947997491 is 1947997492.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2947997491 - 2¹¹ = 2947995443 is a prime.

It is not a weakly prime, because it can be changed into another prime (2947997401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1473998745 + 1473998746.

It is an arithmetic number, because the mean of its divisors is an integer number (1473998746).

Almost surely, 2^2947997491 is an apocalyptic number.

2947997491 is a deficient number, since it is larger than the sum of its proper divisors (1).

2947997491 is an equidigital number, since it uses as much as digits as its factorization.

2947997491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10287648, while the sum is 61.

The square root of 2947997491 is about 54295.4647369373. The cubic root of 2947997491 is about 1433.8675507440.

Subtracting from 2947997491 its reverse (1947997492), we obtain a palindrome (999999999).

The spelling of 2947997491 in words is "two billion, nine hundred forty-seven million, nine hundred ninety-seven thousand, four hundred ninety-one".