2231691481 has 2 divisors, whose sum is σ = 2231691482. Its totient is φ = 2231691480.

The previous prime is 2231691479. The next prime is 2231691487. The reversal of 2231691481 is 1841961322.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2198109456 + 33582025 = 46884^2 + 5795^2 .

It is a cyclic number.

It is not a de Polignac number, because 2231691481 - 2¹ = 2231691479 is a prime.

It is a super-3 number, since 3×2231691481³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

Together with 2231691479, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 2231691481.

It is not a weakly prime, because it can be changed into another prime (2231691487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1115845740 + 1115845741.

It is an arithmetic number, because the mean of its divisors is an integer number (1115845741).

Almost surely, 2^2231691481 is an apocalyptic number.

It is an amenable number.

2231691481 is a deficient number, since it is larger than the sum of its proper divisors (1).

2231691481 is an equidigital number, since it uses as much as digits as its factorization.

2231691481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 37.

The square root of 2231691481 is about 47240.7819685492. The cubic root of 2231691481 is about 1306.8067985891.

The spelling of 2231691481 in words is "two billion, two hundred thirty-one million, six hundred ninety-one thousand, four hundred eighty-one".