1229181941 has 4 divisors (see below), whose sum is σ = 1323734412. Its totient is φ = 1134629472.

The previous prime is 1229181931. The next prime is 1229181949. The reversal of 1229181941 is 1491819221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1491819221 = 199 ⋅7496579.

It can be written as a sum of positive squares in 2 ways, for example, as 287980900 + 941201041 = 16970^2 + 30679^2 .

It is a cyclic number.

It is not a de Polignac number, because 1229181941 - 2¹⁴ = 1229165557 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1229181895 and 1229181904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1229181949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47276216 + ... + 47276241.

It is an arithmetic number, because the mean of its divisors is an integer number (330933603).

Almost surely, 2^1229181941 is an apocalyptic number.

It is an amenable number.

1229181941 is a deficient number, since it is larger than the sum of its proper divisors (94552471).

1229181941 is an equidigital number, since it uses as much as digits as its factorization.

1229181941 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94552470.

The product of its digits is 10368, while the sum is 38.

The square root of 1229181941 is about 35059.6911138704. The cubic root of 1229181941 is about 1071.2036825464.

The spelling of 1229181941 in words is "one billion, two hundred twenty-nine million, one hundred eighty-one thousand, nine hundred forty-one".