1611221939 has 2 divisors, whose sum is σ = 1611221940. Its totient is φ = 1611221938.

The previous prime is 1611221929. The next prime is 1611221951. The reversal of 1611221939 is 9391221161.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1611221939 is a prime.

It is a super-2 number, since 2×1611221939² = 5192072273429839442, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1611221899 and 1611221908.

It is not a weakly prime, because it can be changed into another prime (1611221929) 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, 805610969 + 805610970.

It is an arithmetic number, because the mean of its divisors is an integer number (805610970).

Almost surely, 2^1611221939 is an apocalyptic number.

1611221939 is a deficient number, since it is larger than the sum of its proper divisors (1).

1611221939 is an equidigital number, since it uses as much as digits as its factorization.

1611221939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5832, while the sum is 35.

The square root of 1611221939 is about 40140.0291355151. The cubic root of 1611221939 is about 1172.3351563042.

The spelling of 1611221939 in words is "one billion, six hundred eleven million, two hundred twenty-one thousand, nine hundred thirty-nine".