1611212173 has 2 divisors, whose sum is σ = 1611212174. Its totient is φ = 1611212172.

The previous prime is 1611212171. The next prime is 1611212203. The reversal of 1611212173 is 3712121161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1177656489 + 433555684 = 34317^2 + 20822^2 .

It is a cyclic number.

It is not a de Polignac number, because 1611212173 - 2¹ = 1611212171 is a prime.

Together with 1611212171, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1611212171) 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, 805606086 + 805606087.

It is an arithmetic number, because the mean of its divisors is an integer number (805606087).

Almost surely, 2^1611212173 is an apocalyptic number.

It is an amenable number.

1611212173 is a deficient number, since it is larger than the sum of its proper divisors (1).

1611212173 is an equidigital number, since it uses as much as digits as its factorization.

1611212173 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 504, while the sum is 25.

The square root of 1611212173 is about 40139.9074861913. The cubic root of 1611212173 is about 1172.3327876986.

The spelling of 1611212173 in words is "one billion, six hundred eleven million, two hundred twelve thousand, one hundred seventy-three".